What Causes Negative Fuel Trim At Idle

Therefore, negative fuel trim makes it much more likely that fuel trim is causing the misfire than reacting to it. Possible causes are leaky or defective injectors. Increasing ignition dwell time. 4% Long term fuel trim 1 was -17. This can be a negative or a positive fuel trim. Refer to Diagnostic Aids for DTC P0171 Fuel Trim System Lean. MAF sensor volts at idle 1. A faulty spark plug may cause several engine performance problems, including an engine rough idle. OBD2 Fuel Trim Monitor: When we talk about fuel, trim we have to keep in mind that the O2 sensor is the heart of the fuel control system. Then turned up the fuel on the idle via the MAFT as far as it would go and the voltage moved around a bit for like 20 sec then dropped back to zero and stays at zero now. See FUEL PRESSURE RELEASE. Engine Stalls (Check Engine Light May or May Not Be On). 5 PSI @ 650 RPM (about 2 degree throttle angle) you have an issue. 2L, V6, MFI, SOHC, Eng Desg J32A3 Problem: Automatic transmission malfunction code P0700 is set. If the condition exists in all rpm ranges, the cause is more likely a fuel supply issue caused by low fuel pressure, a restricted injector or a defective sensor input. Making the fuel mixture artificially rich by feeding propane into the intake manifold should cause the sensor to respond almost immediately (within 100 milliseconds) and go to maximum (0. This first article I’ve started at page 3, just so you’re aware. What are the causes of negative fuel trim? I recently was having a problem with high positive fuel trim at idle and suspected a vacuum leak. In this entry you will find information about short-term fuel trims and long-term fuel trims. Fuel Cutoff Mode: No fuel is delivered by the injectors when the ignition is “OFF”. The fuel trim behavior chart for an air metering issue looks very similar to a fuel volume issue (figure 3), but there are differences. If a fuel trim cell's STFT stays negative or positive for too long then it subtracts or adds to that fuel trim cell's LTFT and resets. The long term fuel trim is negative (-7. Page 3 of 4: Check the Fuel Trim values with your Scan Tool in Live Data mode. LTFT near zero). 2% and long term fuel trim 2 was -18%. Issues like leaking fuel injectors, a defective fuel pressure regulator and defective MAF sensors will be addressed. (Bank 1 sensor 1, Bank 2 sensor 1) Long term and short term are pretty much like they say. Vehicle performed the same after a/f sensor install. A negative fuel trim is considered anything at or below the minus 10 percent threshold. A leaky EGR valve can act like a vacuum leak and cause a lean misfire at idle. NOTE: The figure shown above is a guideline only, not an absolute service limit. It can also be caused by high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. To begin this process: 1. 2 (just shy of the magic number 25, which throws the lean fuel trim code) on long, engine braking, no- throttle but moderately high RPM descents in lower gear. P-IDLE, Pitch 10 UP, Trim to 100 KIAS (Maintain wings level 10deg UP) 4. If the displayed fuel trim value is a negative number, it means that the ECU is decreasing the injector pulse width to subtract fuel from the air/fuel mixture to lean out the air/fuel mixture because the input data it is receiving tells it that the mixture is too rich. The ECM made the Short Term trim change because the extra air was measured by the oxygen sensors. Understanding Long Vs. it seems to switch on around 110C then switch off around 105C. 1% Long Term fuel trim 1: -25. Same with the fuel pump bleeding down, that may give you starting problems but won't cause your trim problem. If the control module. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT. Issues like leaking fuel injectors, a defective fuel pressure regulator and defective MAF sensors will be addressed. WOT throttle a bit on the rich side around 11. Since those fixes are both now inconveniently in the fuel tank now (thanks chevy) im looking for any other gremlins that could trick the engine into reading falsely low fuel pressure and maybe cause the computer to overcompensate by adding fuel trim causing a rich idle to prevent a low fuel pressure induced stall. Information gathered at different speed load points are stored in fuel trim cells in the fuel trim tables, which can be used in the fuel calculation. I've changed the O2 sensors, cat, engine temp sensor, plugs, coil packs, and taken everything apart and cleaned it with no luck. Short term fuel trim (STFT)is quick changes to the injector pulse to correct fuel mixture, and long term fuel trim (LTFT)is for continuous steady changes. Record the long term and short term fuel trim PIDS (LONGFT1, LONGFT2, SHORTFT1, etc. The "ideal" trim is 100 for the Low, Middle, and High Trims (1991-1995 pre-OBDII models). A bad MAF sensor will tend to have positive fuel trims at load. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. Therefore, negative fuel trim makes it much more likely that fuel trim is causing the misfire than reacting to it. CEL for P0172 keeps coming up. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. This fault can be stored due to a faulty coolant temperature sensor, excessively high fuel pressure or a faulty fuel injector. From the Toyota repair manual: "If the total of the short-term fuel trim value and long-term fuel trim value is between +33 % and -30 % (engine coolant temperature is more than 75C (167F)), the system is functioning normally. This can be a negative or a positive fuel trim. Fuel trim can be used to investigate possible fuel economy, rough idle and many other engine drivability issues. A healthy engine should have Long Term Fuel Trim numbers around 1 to 3 percent, either positive or negative. So, Injectors are holding. The high idle fuel trim remains, now around +14, and I've noticed a few times that the fuel trim will go to 24. Improper fuel trim (as the leak introduces extra oxygen that is picked up by the (O2) oxygen sensor ) Slow warm-up time (which also causes high fuel consumption ) Catalytic converter to fail prematurely; Sensors ((O2) oxygen sensors) (EGR) Valve function; These factors all depend on where the leak is located in the exhaust. Before driving, turn on the ignition and let vehicle idle for a couple of minutes to let the PCM reprogram its idle settings. FUEL The FS -110 should be operated on a methanol based fuel containing not less than 18% (volumetric) castor oil, or a top quality synthetic lubricant (or a mixture of both), plus a small percentage (5-20%) of nitromethane for improved flexibility and power. Lack of vacuum can also cause problems by allowing unmetered air to enter the engine. Rich condition = more fuel and less air = more oxygen available in exhaust as measured by O2 sensor. If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak. CEL for P0172 keeps coming up. Fuel Cost - the cost per gallon or liter of fuel. Negative values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. Today when I first started up the engine you could hear like a noise coming from the air filter, so what i did was hit the gas the noise went away the engine shake a little for 1-5 sec then it went back to normal. 0 in the short trim. The same conditions under which the spark plug operates, along with poor engine maintenance, may foul the tip with ash, oil, or carbon deposits. Do not add oil to gasoline. The engine computer uses the automatic idle speed (AIS) motor, also know as the idle air control, (IAC) to control idle speed when your foot is off the gas pedal, that is all. Negative torque caused by the airflow going faster through the prop than the prop is pushing is dangerous. 0 Possible Fuel Pump Problem merc 1987 3. If it sees extra oxygen, it has to add fuel to burn that extra oxygen. do fuel pressure test. A visual inspection showed damaged controlled air lines and some damaged breather pipes. This will cause the stem of the engine to move to the left. This is especially notable during shifting due to the condition above. Negative trim improved. SHORT TERM vs. 7:1 is critical to emission control Using a scan tool you can monitor “Fuel Trim” to see if engine is running rich or lean. Additive trim (stft) dips into the negatives very quickly, long term trims are right around 1. Ron addresses the common issues that can cause fuel trims to go negative. Do not handle fuel when smoking or around an open flame or sparks. Bank number refers to the 'side' of the engine (see How are O2 Sensors Displayed?). On top of this, miles of service cause the plug electrodes to wear out, widening the gap. The truck was recently tuned up with new plugs, wires, cap, rotor, and coil. STFT and LTFT percentages are the adjustments made by the PCM to maintain the 14. Fuel filter or fuel tank filter clogged. The symptoms of a bad fuel pressure regulator include engine misfiring, black exhaust smoke, and fuel leak. 4% Long term fuel trim 1 was -17. This class is taken directly from Ron Bilyeu’s full course: The Diagnostic Approach. 4-hole carb adapter, fuel filter and fuel line kit for 3/8” and 5/16” OEM steel fuel lines. By resetting the ECU, the trim values will be set to some neutral default value and all of the trouble codes will be cleared. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT. Under normal circumstances, you’d want to check Freeze Frame for as many codes as possible to see the conditions under which the fault is occurring. A fouled spark plug, bad plug wire or a bad coil on a DIS system causes ignition misfire that overloads the converter with fuel. 0 ms or lower to correct for a hot-idle, excess fuel condition. This is because the fuel injectors are responsible for putting fuel into the engine. Lean condition = more air less fuel = less oxygen available caused by intake air leak after the MAF, fuel delivery, vacuum leak, etc. Auto-Lean position, where fuel flows through the enrichment and lean fuel metering jets. RICH fuel mixtures will generate NEGATIVE fuel trim values. Maf sensor 3. P-IDLE, Pitch 10 UP, Trim to 100 KIAS (Maintain wings level 10deg UP) 4. A faulty spark plug may cause several engine performance problems, including an engine rough idle. The fuel trim chart on the left shows negative fuel trims at idle and positive fuel trims at cruising speeds. If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak. Jump to Latest Follow And, a vac leak tends to make things go lean with unmetered air which would normally lead to a positive fuel trim. On a V-style engine you can isolate which. Engine speed should increase 50 RPM, and idle speed feedback should remain at 128 17. 2 (just shy of the magic number 25, which throws the lean fuel trim code) on long, engine braking, no- throttle but moderately high RPM descents in lower gear. This indicated a vacuum leak. NOTE: The figure shown above is a guideline only, not an absolute service limit. Once I start driving ,however, both the STFT and long term fuel trim approach normal limits (i. What it has done, is at some point both banks’ primary lambda sensors have reported a rich condition for an extended period of time. I have negative fuel trims. following PIDS: IACTRIM, IACKAM2, IACKAM3. Rich condition = more fuel and less air = more oxygen available in exhaust as measured by O2 sensor. OIL PRESSUREOil pressure (at normal operating temp. This fault can be stored due to a faulty coolant temperature sensor, excessively high fuel pressure or a faulty fuel injector. One set of Fuel Injector Clinic’s newest 1,650 cc/min injectors, and two sets of the earth-flooding 2,150 cc/min unit. I have replaced the fuel pump, fuel filter, and the idl. The low trim is for idle and low rpm cruise conditions. All it takes for fuel to varnish is about 6 to 8 months of sitting. long term fuel trim, must have a logging tool. This is the variable it uses to force. Negative trim shows too rich. 6 petrol Zetec SE) for a while now and I'm kinda baffled. Negative fuel trim percentages indicate the PCM is attempting to lean out the fuel mixture, to compensate for a perceived rich condition. A vacuum leak would cause a lean condition at idle and would be better around 2500 RPM. Fuel trim is located on the 3D tuning page. Immed after clear turn, set 400 ft-lbs. You may encounter a customer concern of oil consumption, oil leaks, blue smoke from the exhaust, MIL or fuel trim codes. And like OBDI, high trim is all flow above a certain value. Positive fuel trim it is adding fuel to correct a lean condition negative it is removing fuel to correct a rich contition, short term fuel trim will vary at idle between positive and negative, long term fuel trim is learned by pcm from the short term fuel trim values. Inspect the entire inlet air system from the Mass Air Flow (MAF) sensor to the intake manifold for leaks such as: - Cracked or punctured outlet air tube or air cleaner housing assembly. For those who have a scanguage, there is a xgauge code that allows you to read the fuel trims. Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. This will cause the stem of the engine to move to the left. The first step in the diagnosis of a code P0171 is to look at a minimum of three ranges of the Long Term Fuel Trim numbers on a scanner. Error Code P0170 is set when the PCM has detected an anomaly on fuel (fuel trim) that is outside the range of the vehicle’s specifications. This WILL cause the vehicles to to run Rich and have high Negative Fuel Trims. Do not handle fuel when smoking or around an open flame or sparks. What could cause the PCM to subtract fuel from only one bank during a misfire? A rich biased O2 sensor may cause inappropriately negative fuel trim on one bank, resulting in a lean misfire. Do not add oil to gasoline. Ron addresses the common issues that can cause fuel trims to go negative. If the engine is unstable after start -. An air–fuel ratio meter monitors the air–fuel ratio of an internal combustion engine. FUEL Fill the fuel tank with clean, fresh gasoline from a clean fuel can. • Check items that can cause an engine to run lean (long term fuel trim is significantly in the positive range). A positive fuel trim beyond 10% is almost always a sign of a vacuum leak or air leak in the air duct system. The ideal fuel trim values are around 0 percent. This causes the fuel trim numbers to become negative during a boost situation. In some cases, these additives have indicated slightly negative effects on the performance. A positive fuel trim value indicates that the PCM is adding fuel in order to compensate for. Fuel trims may also be negative at idle with a bad or dirty MAF. If you create a vacuum leak, O2 voltage will go low. If you change cells the LT will display the contents of that cell. Raise engine to 2500 RPM's, hold and re-check. Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. Fuel trim is a calculation based on the O2 sensor readings from the sensors at position 1. Can a dirty Maf cause this? My car is running rich at idle when I monitor the fuel trims by obd. Afaik it's taking Fuel away cause it's rich yes. If you are reluctant to remove the fuse, another option is to disconnect the battery (negative, or black, cable first), wait ten minutes, and then reconnect it. The most common problem here is contamination of the sensor element with dirt or fuel varnish. For example, if LTFT B1 is 25% at idle but corrects to 4% at both 1500 and 2500 rpm, your diagnosis should focus on factors that can cause a lean condition at idle, such as a vacuum leak. The short term fuel trim 1&2 was -2. Looking at previous posts the fan on my mini is either full on or not at all. Fuel trims ate running way negative, sometimes up to -30. If the STFT immediately decreases and moves to acceptable levels and the LTFT slowly starts to come back down, you have a vacuum leak. The O2 sensors will be the indicator or as one of my students has said, is the snitch of the air/fuel mixture. Here is the data from our subject vehicle. In other words, if left uncorrected, the engine would be running too rich. It depends on the response of the O2 sensor. $3 fix, but lots of time and frustration. The fuel trim figures for both banks should be around the 0 and normally jump a bit from -4 to +4. That is an indicator of what you feel with the hesitation. Fuel trims may also be negative at idle with a bad or dirty MAF. Pressure while running (assume at idle) is higher than prime (zero vacuum). Monitor your fuel trim at idle, if you engine is running lean your fuel trim is high. This class is taken directly from Ron Bilyeu’s full course: The Diagnostic Approach. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT. These adaptations are made to the engine while at idle. $3 fix, but lots of time and frustration. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. Positive fuel trim means the ECU thinks the motor is running lean and is adding fuel. The long term fuel trim doesn't look so prefect but not bad, I have attached the graph which shows the drive and idle time. When you increase the throttle, the effect is to push a burst of oil onto some of the cylinders as the hoses clear themselves. The percentage reading represents the difference either above or below the anticipated amount. Do you have just a fuel trim code or do you also have misfire codes. ; Some possible causes of LEAN fuel mixtures include:. The car runs good other than fuel trim numbers and some intermittent idle/rpm issue. Cams with negative overlap up to zero, set idle to 850-900 all cells across the board, add 1 g/sec to idle airflow across the board both in P/N and in gear (HPT > Engine > Idle > Idle Airflow > Base Running Airflow), add 2º of idle timing 1200 rpm and under and 0. If the PCM is subtracting fuel to maintain the desired air/fuel ratio, you wind up with a negative fuel trim. 9 PSI to be present at idle. It can also be caused by high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. Driving fast causes your truck to work harder, burning more fuel and ultimately requiring even more fill-ups than if you drive at a more reasonable speed. Causes for the code being set include; a defective Mass Air Flow meter (MAF), low fuel pressure, air leakage, oil level too high, dirty oil. 7) to burn one part of fuel with no excess oxygen or fuel left over. 8 After any repair attempt test drive the vehicle for a while then check the long term fuel trim. This can be a negative or a positive fuel trim. <<>> the O2 sensor and the clogging up of the converter. Increasing injector on time of fuel delivery. What it has done, is at some point both banks’ primary lambda sensors have reported a rich condition for an extended period of time. Trim fuel supply hose to length and attach hose fitting U. I thought the vvt system was the cause of the negative trim at idle. Some commercial fuels also contain coloring additives as an aid to fuel level visibility. do fuel pressure test. Always evaluate fuel trims at idle and at 2500 RPM. The fuel trim and the AFR always seem to be about 1/2 second out of phase. After replacing the MAF and correctly torqueing the mount bolts I seem to have corrected the idle trim however now the fuel trim swings negative at low rpm. Disconnect the Breather Pipe At Intake Manifold. An MAF that over-reports airflow at idle will result in a rich condition and negative fuel-trim corrections. The middle trim is for medium cruse rpm's (1500-2500ish) and the high fuel trim is for 2500+ rpm. At both idle and 2500 RPM, after engine warm up, the post-cat short fuel trim is hovering about 50%. The injector pulse width was lengthened. Refer to Trim Panel Replacement - Rear Quarter - Right in Interior Trim. Low Fuel Trim = less than (94-106) Hz, Mid Fuel Trim = (94-106) to (170-182) Hz, High Fuel Trim = greater than (170-182) Hz, and there is also an O2 Trim (used in closed-loop mode). , it senses too much air, so too much fuel is injected for the actual amount of air, and the O2 sensor is used by the ECU to get the AFR back down to stoich. Do not use gasoline containing methanol. Fuel Trim Cell breakdown by MaP vs RPM If this is your first visit, be sure to check out the FAQ by clicking the link above. If you create a vacuum leak, O2 voltage will go low. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. If the fuel trim comes down chances are you have a vacuum leak. Mileage-may or may not suffer depending on how much the air fuel mixture has changed. Ignition misfire-repair, 4. Negative trim shows too rich. For fuel long trim anything in the negative range is rich and the computer should tell the engine to pull out fuel and anything in the positive range is lean and the computer should tell the engine to add more fuel to meet the 0. From LS-54 Diagnostic Strategies: Ignition & Misfires, As with Part 1 on Air Induction and Part 2 on Fuel Delivery, this course is designed to help the techn. Any or all of the following DTCs may be current or set in history: P0106 P0171 P0299 P0507 P1101 P2096. On a fully warmed up engine, look at Long Term Fuel Trim at idle, in Neutral, A/C off, (LONGFT1 and/or LONGFT2 PIDs). Page 3 of 4: Check the Fuel Trim values with your Scan Tool in Live Data mode. I have have been dealing with this P0171 diagnostic trouble code for many years on many different year make and model vehicles. When engine RPM was raised (off idle) short term fuel trim dropped to a normal range. Modern Engine Management Systems (EMS) use an oxygen sensor in the exhaust to monitor the air to fuel ratio (AFR). I have 112,000 miles, a K&N intake Kit, changed cone filter a couple months ago, changed spark plugs and wires, checked fuel pressure which is 58 while idling and holds at 55 with key in ignition, and a catch can. 4% Long term fuel trim 1 was -17. So a short term fuel trim reading of +20 percent indicates 20 percent more fuel had to be added to achieve the proper air-fuel mixture. (likewise if liquid fuel comes out of the hose). This is why I recommend testing fuel trims at a steady cruise when testing a MAF. 3 in park the richen up a little in drive but idle is poor and misses under - Answered by a verified Chevy Mechanic Would have burn valve cause fuel trims in the negative. If the engine is unstable after start -. 1988 Wellcraft 210 Classic Mercruser 5. 6 and tooling around generally flopping between 14. And engine running slightly rich would result in a negative long term fuel trim number. it seems to switch on around 110C then switch off around 105C. Fuel trim is a calculation based on the O2 sensor readings from the sensors at position 1. If water is. This causes the fuel trim numbers to become negative during a boost situation. It is really bad when I pull to a stop sign or traffic light. The first field tells the fuel trim at idle (Additive). -In-line fuel filter. 4% (does anyone know what "fuel trim 3" is?) Long term fuel trim 3 97. On really old vehicles, vacuum is also required to pull fuel into the carburetor. Here is a modified data. This data was captured from a 2000 Pontiac GrandAm. The EGR valve receives vacuum at the proper time during a road test. I watched the MAF data during wide-open throttle runs. A/F is expressed as either a ratio (14. The fuel trim is monitored under various loads and conditions. Some possible causes of LEAN fuel mixtures include: Air or vacuum leaks in the intake manifold, near the throttle body or at vacuum hose connections. Other possible causes of the error code include engine mechanical problems, a faulty fuel-pressure regulator, ignition misfires or problems with the fuel line or fuel injectors. Initial scan freeze frame data showed code set at idle. 90% of converter replacements are NOT really necessary, it is becaue 95% of technicians do NOT fully understand the. Let's begin by getting the basics out of the way. 3rd, Engine miss at idle or on acceleration, I agree, have the plugs coils and wires checked and perform all routine maintenance. With iso-octane ("ideal" gasoline), Lambda of 1. If Short Term Fuel Trim is significant or has been stable, adjust LONG TERM FUEL TRIM. Is it normal for the long term fuel trim to be high at idle? The scanguage reads 22% at idle, but goes to single digits. Here is the data from our subject vehicle. The ECU controls Air/Fuel mixture in order to maintain power, efficiency, and emissions. A lesser-known problem that causes poor fuel mileage is an exhaust leak ahead of the first oxygen sensor (s). It appears that for some reason the engine is running rich at idle and the computer is attempting to compensate for that by reducing the fuel injection pulse width. 9 PSI to be present at idle. Disconnect the fuel injector wires from the fuel injector heads, by unsnapping the clips. To allow the computer to relearn idle speed and air/fuel ratio properly after a. Running too rich - High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2. DESCRIPTION. Normally, a vacuum leak would set a fuel trim fault code at idle or very low engine RPMs. If you smell any fuel vapors at all, this is leaking and needs to be replaced. Fuel trim should be checked at idle, at 1500 rpm and at 2500 rpm. Afaik it's taking Fuel away cause it's rich yes. The ideal value is near 0% but variations of ±20% are acceptable. The second field tells the fuel trim at elevated engine speeds (Multiplicative). Always evaluate fuel trims at idle and at 2500 RPM. This code means there’s a malfunction in the computer’s control of air to fuel ratio. Short-term trim is analogous (for older control modules) or digital (nowadays control modules) solution, which stabilizes one or another parameter (creates closed loop […]. Air Fuel Control The Stoichiometric mixture of 14. When a technician disconnects and connects the low voltage battery, these settings are erased. A positive trim value means the ECM is ADDING fuel at 12-14% above the programmed rate. Weak fuel pump that is not generating enough pressure or volume Fuel line restrictions (like a pinches hose or plugged filter). I don't see how a fresh-from-Bavaria M5 would suffer from any of these. The same conditions under which the spark plug operates, along with poor engine maintenance, may foul the tip with ash, oil, or carbon deposits. A “sharp 90 degree” is defined as any that causes the fuel line to bend in such a way that the ends of the bend are less than six inches apart. This low side pressure will not vary under normal conditions and is sometimes controlled by a pressure regulator or by pulse width modulating the fuel pump. 7:1 for example) or as a Lambda value. cause the ECU to deliver more or less fuel to the engine. Inspect following PIDs: RPM. If a vehicle is driven at WOT (Wide Open Throttle) or high loads, the fuel system normally goes open-loop, rich to provide maximum power. aid to fuel level visibility. If your fuel pressure regulator has a leaking diaphragm the fuel will enter the engine through the vacuum line and cause negative fuel trims, more so at idle than when at cruise. Possible causes of LEAN fuel mixtures include: Air or vacuum leaks in the intake manifold, near the throttle body or at vacuum hose connections. The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. Negative trim shows too rich. Total fuel trim (LTFT + STFT) at idle is -12%, and total fuel trim at cruise is +9%. The fuel trim values would be on the negative side and we would likely have a P0172/P0175 (Bank 1 and 2 Rich). 7L with about 82,700 miles on it. Let's begin by getting the basics out of the way. The low pressure pump supplies fuel to the high pressure pump at what were normal pres- sures for a port fuel injected engine. With the trims being almost identical it is something affecting all cylinders, so an injector problem is unlikely. All maintenance done at dealer during certification. Conversely, a negative fuel trim indicates that the ECU is reducing the fuel delivery for that range, meaning that the MAF scaling in that range is slightly too high. It contains two wires, one heated to a known value of 100° C (212° F) above the other. This data was captured from a 2000 Pontiac GrandAm. The varnished fuel is stubborn and it clogs the small passages and jets. Underhood Service Magazine:. How to reset long term fuel trims? If this is your first visit, be sure to check out the FAQ by clicking the link above. A negative fuel trim value means the engine computer is subtracting fuel. Do you have just a fuel trim code or do you also have misfire codes. What the LTFT is telling us is that it has to continuously add 13% more fuel. The car runs good other than fuel trim numbers and some intermittent idle/rpm issue. Description applies not only to N43/N53 engines, but to all progressive BMW engines. 2 ms for SC engines), misfires, bad idle, hesitation when engine is cold, Long Term fuel Trim that bounces around under steady highway cruise on the flat. Leave fast idle lever OFF (p. That is an indicator of what you feel with the hesitation. From the Toyota repair manual: "If the total of the short-term fuel trim value and long-term fuel trim value is between +33 % and -30 % (engine coolant temperature is more than 75C (167F)), the system is functioning normally. Position the center roller bracket at the front of the track. 7:1 for example) or as a Lambda value. Throttle Potentiometer or Idle Speed Stepper Motor: Faulty Potentiometer or wiring, or faulty idle speed motor or wiring: 1233: Wheel-speed sensor FL: Speed sensor cable, wiring connection, speed sensor, excessive or insufficient gap between sensor and pulse wheel, sensor or wheel dirty or damaged: 1241: Wheel-speed sensor FR. This can cause hard/no starts as well, but usually results in a rich running condition (fuel trims in the negatives). Positive fuel trim means the computer is adding extra fuel (too lean). F-DOWN, P-IDLE, Pitch up 10deg. When the battery is disconnected or a new battery is installed, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. Followup from the Pelican Staff: You have a fuel trim fault. Information gathered at different speed load points are stored in fuel trim cells in the fuel trim tables, which can be used in the fuel calculation. When everything is stable and working correctly, fuel trim numbers should be no greater than 10%, and total fuel trim should be no more than 10% when the numbers are added together. Idle Percent - the ratio of Drive Time vs. From the table above it is clear just how much an. Be sure to keep fuel line away from moving parts and hot exhaust components. Fuel trim is a two-part adaptive strategy that adjusts fuel injector pulse width (open time) to adapt to wear, defects, or changes in the system. If lean, the PCM "adds fuel" which results in a positive fuel trim. Vac leak will definitely cause negative trims! Negative trims indicate a "lean" condition typically caused by unmetered air entering the engine/combustiin cycle. what is the exact code that is being set. GM > Engine > Fuel Control > Open & Closed. 4% Long term fuel trim 1 was -17. This disrupts the air/fuel ratio. (Fuel pump relay) OFF/ON. Seems to sit roughly -4% which isn't massively out of whack (I would say). Misfire – If the air fuel mixture has gotten too far from factory specs, this can cause the Silverado to misfire. Disconnect the negative battery cable. Lean fuel mixtures are a more common problem than R ich fuel mixtures, Though either can happen depending on the cause. long term fuel trim, must have a logging tool. The STFT pre-cat drops to about 1% at engine warmup. I make a living actually diagnosing problems, not throwing parts at an issue. Start by checking fuel control using a Porsche scan tool. If it sees extra oxygen, it has to add fuel to burn that extra oxygen. Welcome to the Dodge Durango Forum! Dodge Durango Forum - Forums and Owners Club! This forum is dedicated to the Dodge Durango and its owners! We are a tight knit community of like minded enthusiasts who value "on topic", clean discussion. Idle speed is set incorrectly. Other possible causes of the error code include engine mechanical problems, a faulty fuel-pressure regulator, ignition misfires or problems with the fuel line or fuel injectors. On really old vehicles, vacuum is also required to pull fuel into the carburetor. NEGATIVE (-) fuel trim values mean the engine computer is subtracting fuel (decreasing the pulse width or on-time of the fuel injectors) to reduce the amount of fuel injected into the engine. Long Term Fuel Trim Add. 02 sensor 2. LTFTs are considered ' multiplicative ' as it multiplies a factor the the base map. 1 v) to near maximum (0. Idle about 9500-950 rom. Modern Engine Management Systems (EMS) use an oxygen sensor in the exhaust to monitor the air to fuel ratio (AFR). Pressure while running (assume at idle) is higher than prime (zero vacuum). For E38, Select DVT, then Fuel System, and then click on Fuel Trim Reset 2011 VE SSV 417 + CAM + Whipple 2. 4% Long term fuel trim 1 was -17. One set of Fuel Injector Clinic’s newest 1,650 cc/min injectors, and two sets of the earth-flooding 2,150 cc/min unit. Overtime I check the trims I add them to the base table and eventually it brought my idle VE value as low as 28%. The symptoms of a bad fuel pressure regulator include engine misfiring, black exhaust smoke, and fuel leak. A negative fuel trim value means the engine computer is subtracting fuel. They removed a lot of extra junk, mainly for EVO's, but added items to log even more features. Switch the ignition to ON: OFF. I had the oxygen sensors and the fuel pump and fuel filter replaced. At both idle and 2500 RPM, after engine warm up, the post-cat short fuel trim is hovering about 50%. The trim designer is accessible only once you have created a car model, designed the chassis, and have selected or designed an engine for your car. A dirty MAF sensor can cause this issue, but that diagnosis can be tricky. max manifold vacuum, the fuel pressure regulator should reduce the fuel pressure by up to 10". If any of these conditions are found, the fuel line or primer bulb must be replaced. This can be a negative or a positive fuel trim. to Diagnostic Aids for DTC P0172 Fuel Trim System Rich. Excessive oil consumption, not due to leaks, is the use of 0. Sensor working properly seeing too much oxygen and despite increased trim still running too lean based on massive vacuum leak (should have high idle) or insufficient fuel delivery based on injector clog dirty or bad harness expect code for one or more single cylinder miss or inadequate fuel pressure at rail expect worse stumble at high load. Maf sensor 3. Pull the vacuum line and see if it is wet inside or if any fuel drips out of the regulator. Mileage-may or may not suffer depending on how much the air fuel mixture has changed. ShrtTrm Fuel Trim. Has been great vehicle. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. 9 L (1 qt) or greater of engine oil within 3,200 kilometers (2,000 miles). I had a autel scanner that showed the short term fuel trim was taking some fuel away because eof a rich condition but the long term fuel trim is close to 0. 7:1 is critical to emission control Using a scan tool you can monitor “Fuel Trim” to see if engine is running rich or lean. The fuel pressure regulator may be operating at too low a pressure. 5 PSI @ 650 RPM (about 2 degree throttle angle) you have an issue. seems like a complete tuneup with valve adjustment is in order to start troubleshooting this. If long-term fuel trim (LTFT) for bank 1 is 25% at idle, but corrects to 4% at 1,500 and 2,500 rpm, focus on factors that cause a lean condition at idle, such as a vacuum leak. Fuel trims may also be negative at idle with a bad or dirty MAF. The ECU will also store trouble codes for diagnostic capability. Improper fuel trim (as the leak introduces extra oxygen that is picked up by the (O2) oxygen sensor ) Slow warm-up time (which also causes high fuel consumption ) Catalytic converter to fail prematurely; Sensors ((O2) oxygen sensors) (EGR) Valve function; These factors all depend on where the leak is located in the exhaust. It consists of the "base fuel map" (BFM) which is hard coded into the ECM, and the adaptive LTFT. 0 psi, optimum pressure is 5. Once I start driving ,however, both the STFT and long term fuel trim approach normal limits (i. 3rd clutch transmission fluid pressure switch code P0847 is set. A fuel trim of 0% is perfect, but unrealistic, some amount of trim should always be expected, and even required for proper vehicle operation. Fuel trim can be used to investigate possible fuel economy, rough idle and many other engine drivability issues. Usually doubles as the hose barb for the fuel line (hose) connection. Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing. This fuel shut off mode protects the powertrain from damage, and improves drivability. Make sure your fuel pressure does not exceed 6. Pretty neat feature I should say, but then discovered a potential problem. fuel; a negative percentage, subtracting fuel. The second field tells the fuel trim at elevated engine speeds (Multiplicative). When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Press and hold UP and DOWN arrows simultaneously for 3 seconds to UNLOCK or LOCK the display. Check engine light is off and vehicle out of limp mode. Fuel Cost - the cost per gallon or liter of fuel. When running at closed throttle idle, ie. This number should be at zero as a base setting, by going negative you are reducing the amount of time it takes to return to Idle, and by going positive you are increasing the time it takes. Model engine fuel is also highly flammable. Negative values show that the engine is running too rich and oxygen sensor control is making it more lean by reducing the amount of time that the injector are open. The fuel trim is monitored under various loads and conditions. The 1998 Toyota Tacoma pickup truck uses an in-line fuel filter to remove contaminants from the gasoline before they can reach the engine. This owner’s manual is considered a permanent part of the outboard motor and should remain with the outboard motor if resold. The engine computer uses the automatic idle speed (AIS) motor, also know as the idle air control, (IAC) to control idle speed when your foot is off the gas pedal, that is all. The middle trim is for medium cruse rpm's (1500-2500ish) and the high fuel trim is for 2500+ rpm. P0171 is a very common code for any ODB2 vehicle. When running at closed throttle idle, ie. Record the long term and short term fuel trim PIDS (LONGFT1, LONGFT2, SHORTFT1, etc. Fuel trims at a hot idle= stftrm1=fluctuate from -0. Under this condition the fuel trim data will display a negative value. to your engine backfiring or the smell of fuel when you decelerate your vehicle. 1 v) to near maximum (0. If the fuel injectors are faulty, they could leak fuel into the cylinders rather than delivering the precise amount needed for the air-fuel ratio. Fuel trims would go positive around 9% on the highway, and turn negative at idle. This causes the fuel trim numbers to become negative during a boost situation. The short term fuel trim 1&2 was -2. The rubber water pump impellar blades have turned brittle and they will crack off. Weak fuel pump that is not generating enough pressure or volume Fuel line restrictions (like a pinches hose or plugged filter). When the feedback from the HO2 sensors shows a deviation, the PCM adjusts the amount of fuel the injectors deliver, in an effort to hit the stoichiometric goal. This will cause the stem of the engine to move to the left. Fuel trims ate running way negative, sometimes up to -30. 9 L (1 qt) or greater of engine oil within 3 200 kilometers (2,000 miles). Afaik it's taking Fuel away cause it's rich yes. This owner’s manual is considered a permanent part of the outboard motor and should remain with the outboard motor if resold. A -20 percent short term fuel. This is why I recommend testing fuel trims at a steady cruise when testing a MAF. seems like a complete tuneup with valve adjustment is in order to start troubleshooting this. A negative trim indicates a rich condition (less fuel required) while a positive means the engine is running on the lean side. Ignition misfire-repair, 4. After reviewing the differences between the stock and mailorder tunes, the only thing that I can see that could cause negative. My only real problem was MPG taking a pretty big drop. Short term fuel trim. Note that vacuum leaks after the throttle body cause negative fuel trims at idle on Speed Density systems. The trim designer is accessible only once you have created a car model, designed the chassis, and have selected or designed an engine for your car. A dirty MAF sensor can cause this issue, but that diagnosis can be tricky. Mechanical Misfire Mechanical problems can also cause an engine to misfire. aid to fuel level visibility. This fault can be stored due to a faulty coolant temperature sensor, excessively high fuel pressure or a faulty fuel injector. Lack of vacuum can also cause problems by allowing unmetered air to enter the engine. If the LTFTs are consistently in positive trim during idle and the engine is difficult to start while cold, then suspect that the fuel pressure regulator is under-pressurising the fuel rail. If your engine is a 4 cylinder, then it has only one bank, Bank 1. The MAF is reading 15g/s at idle which i believe is high, should be around 3g/s?. 3 s-10, it came back as ign adv= -12 degrees. Seems to sit roughly -4% which isn't massively out of whack (I would say). The long term fuel trim doesn't look so prefect but not bad, I have attached the graph which shows the drive and idle time. Remove exhaust crossover heat shield and power steering pump bracket. You can check your fault code freeze frame data using an OBD II scan tool, similar to how you would check for fault codes. The 1998 Toyota Tacoma pickup truck uses an in-line fuel filter to remove contaminants from the gasoline before they can reach the engine. 75, the 1/8 throttle position (all 100% pilot flow) will be rich. ) ignition, 2. A/F is expressed as either a ratio (14. If any of these conditions are found, the fuel line or primer bulb must be replaced. If the vehicle stalls, re-start it, and let it idle for about 10 minutes. Negative LTFT's with the engine warm, low RPM. The Fix: Check the fuel pressure with a fuel pressure gauge. So it would tell the PCM it's lean, PCM would add fuel to compensate creating a rich running car. Here is the data from our subject vehicle. 000 - lambse) * 100 , It is the exact same representation of Lambse. When a technician disconnects and connects the low voltage battery, these settings are erased. Do not remove the fuel cap or add fuel to the tank while the engine is running or hot. If you are reluctant to remove the fuse, another option is to disconnect the battery (negative, or black, cable first), wait ten minutes, and then reconnect it. I know it is not an issue yet, I'd like to prevent it before developing into a real issue. I've been trying to solve an issue with my car (2002 Ford Focus 1. The Fix: Set idle speed to specs. Other potential issues could be a bad MAF sensor, failing o2 sensor, or you may have a map flashed that is not designed for your intake or injectors. To allow the computer to relearn idle speed and air/fuel ratio properly after a. I am still lost finding this problem. This can be a negative or positive trim. , it senses too much air, so too much fuel is injected for the actual amount of air, and the O2 sensor is used by the ECU to get the AFR back down to stoich. Common reasons for this include over-reading MAF's, excessive fuel rail pressure and leaky fuel injectors. From LS-54 Diagnostic Strategies: Ignition & Misfires, As with Part 1 on Air Induction and Part 2 on Fuel Delivery, this course is designed to help the techn. Connect the fuel line from the engine to the fuel tank and squeeze the primer bulb until firm. Negative number -0% = lean command (computer decreasing injection duration) for a rich condition +/-10% is factory settings Fuel Trim Operation The engine computer watches the O2 sensor signal voltage and modifys the fuel trims to accomodate the engine load demands. In this example we'll examine the possible causes of a +13% long term fuel trim. The injector pulse width was lengthened. START FUEL DROOP% FUEL RAMP. A bad MAF sensor will tend to have positive fuel trims at load. When the battery is disconnected or a new battery is installed, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. Auto-Lean position, where fuel flows through the enrichment and lean fuel metering jets. When running at closed throttle idle, ie. " A positive fuel trim value means that the system is being made lean by the trim value. If reverse thrust is required during landing rollout, this is accomplished. The approximate airflow ranges for the three trims are: Low: 0-125 Hz Mid. I make a living actually diagnosing problems, not throwing parts at an issue. Increasing injector on time of fuel delivery. Negative trim shows too rich. 1) Possible causes. Allow vehicle to idle until the IACTRIM PID is 0. Inspect air filters, check for vacuum leaks, false air leaks, crankcase ventilation leaks or restricted hoses, and test fuel pressure both at idle and under load. 7:1 is critical to emission control Using a scan tool you can monitor "Fuel Trim" to see if engine is running rich or lean. Low Fuel Trim = less than (94-106) Hz, Mid Fuel Trim = (94-106) to (170-182) Hz, High Fuel Trim = greater than (170-182) Hz, and there is also an O2 Trim (used in closed-loop mode). Do not allow it to come into contact with the eyes or mouth. If the fuel pressure regulator is stuck, it can cause a rich condition due to the high pressure. Afaik it's taking Fuel away cause it's rich yes. Start by checking fuel control using a Porsche scan tool. Mechanical Misfire Mechanical problems can also cause an engine to misfire. Then I set my loop up/down into the teens range (15 or so) and let the idle fuel stabilize a bit. A positive fuel trim beyond 10% is almost always a sign of a vacuum leak or air leak in the air duct system. Connect the fuel line from the engine to the fuel tank and squeeze the primer bulb until firm. Generally, a healthy engine should produce a steady 17 to 21 in. This means that Long Term Fuel Trim will learn lean (negative) corrections at idle and, learn rich (positive) corrections at higher airflows. I'll attach photos from the scanner of a warm idle. On really old vehicles, vacuum is also required to pull fuel into the carburetor. Keep this owner’s manual handy, so you can refer to it at any time. Misfire – If the air fuel mixture has gotten too far from factory specs, this can cause the Silverado to misfire. Now the fuel filter and the k&n air filter are old so I will change them , however unless its a PCM issue, I'm leaning towards a leaking injector. Two new fuel rail hose connector o-rings GM PN 14104675 (discontinued by GM) will be needed as well as two plenum gaskets GM PN 10168684. When the trim is greater than 100 then the ECU is adding fuel because it perceives that the closed loop A/F was on the lean side of "14. That can be done by viewing fuel trim numbers. Fuel trim is a calculation based on the O2 sensor readings from the sensors at position 1. (Removing Fuel to fix the issue) Also, clearing fault codes, even if none exist, will reset fuel trims. Tie the plane down or remove the prop and test the different settings. When the battery is disconnected or a new battery is installed, the engine must relearn its idle and fuel trim strategy for optimum driveability and performance. If it is more negative than -12%, the fuel system has learned lean corrections which may be due to the MAF sensor over-estimating air flow at idle. If fuel trim is over 10% (positive or negative) you. Next, disconnect the electrical plug from the mass air sensor. Your fuel pressure is probably ok because it starts and runs ok. Maximum speed change allowed from trim input Enables Manual/Auto locking of display. An air–fuel ratio meter monitors the air–fuel ratio of an internal combustion engine. Excessively positive Additive values indicate a lean condition. I've also disconnected the battery to reset the fuel trims and they are back to the usual negative numbers. Had developed slightly high idle speed, 1000-1200 rpm. Bank number refers to the 'side' of the engine (see How are O2 Sensors Displayed?). Most turbo-prop engines have a governor feature that automatically adjusts the prop pitch to prevent negative torque and have engine fuel controls that will automatically trim. 0 ms or lower to correct for a hot-idle, excess fuel condition. The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. Recently we have seen a few M52 (323/328 models) that for some reason do not have proper intake manifold vacuum to the fuel pressure regulator causing the full fuel pressure of 3. exhaust, MIL or fuel trim codes. Re: high idle and negative fuel trim also fixed the seatbelt retractor, what a pain. Immed recover after 1st stall indication. Fuel filter has about 14,000 miles on it. Possible causes of LEAN fuel mixtures include: Air or vacuum leaks in the intake manifold, near the throttle body or at vacuum hose connections. A “sharp 90 degree” is defined as any that causes the fuel line to bend in such a way that the ends of the bend are less than six inches apart. 3 positive on each bank and my long term stayed in the negative 3 range on both banks. A leak downstream of the fuel pump will not allow the system to hold a prime. I've also disconnected the battery to reset the fuel trims and they are back to the usual negative numbers. xml file that Ceddy and KeyDiver worked on. The controls in the Translator allow adjustments under different operating conditions (idle, cruise, boost, and rpm) to allow the user to tune for optimum fuel efficiency or performance. Since installing my mailorder tune and monitoring my fuel trims, I've noticed that my long-term fuel trims are ALWAYS in the negatives - usually pretty consistently between -5 and -10 - but sometimes as much as -15. The short term fuel trim (STFT) refers to immediate changes in fuel occurring several times per second. NEGATIVE (-) fuel trim values mean the engine computer is subtracting fuel (decreasing the pulse width or on-time of the fuel injectors) to reduce the amount of fuel injected into the engine. Idle Issues- With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running. Mechanical Misfire Mechanical problems can also cause an engine to misfire. The fuel map is a two dimensional table of values, sort of like an Excel spreadsheet, for how much fuel to squirt, based on engine RPM and load value. Mileage-may or may not suffer depending on how much the air fuel mixture has changed. The prop can overspeed and cause propeller or gearbox damage. If you have done all steps correctly the blue LED will light up in the ECU when the “Idle” command, (trim and throttle stick set to idle positions on the transmitter). The fuel trim behavior chart for an air metering issue looks very similar to a fuel volume issue (figure 3), but there are differences. A Basic Idle Tuning Strategy. Then check parts depending on if vehicle is rich or lean and when. Fuel trim would show the correction being made to correct for the economy problem. Remove air intake duct and air cleaner assembly. seems like a complete tuneup with valve adjustment is in order to start troubleshooting this. From the Toyota repair manual: "If the total of the short-term fuel trim value and long-term fuel trim value is between +33 % and -30 % (engine coolant temperature is more than 75C (167F)), the system is functioning normally. The fuel map is a two dimensional table of values, sort of like an Excel spreadsheet, for how much fuel to squirt, based on engine RPM and load value. For example, if LTFT B1 is 25% at idle but corrects to 4% at both 1500 and 2500 rpm, your diagnosis should focus on factors that can cause a lean condition at idle, such as a vacuum leak. world would be at 0%, and the short term fuel trim would be fluctuating from approximately ‐. MAF sensor failure, 5. The STFT pre-cat drops to about 1% at engine warmup. Remember, all this is based on what the oxygen sensors are telling the engine computer. The most common problem is an air intake system vacuum or intake hose being loose, cracked, or missing it’s plastic fittings and clamps. The long term fuel trim doesn't look so prefect but not bad, I have attached the graph which shows the drive and idle time. xml file that Ceddy and KeyDiver worked on.

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