Isolate components by blocking vacuum hoses, either by removing and plugging them, or by crimping them off. V6 and V8 engines have two sets of both fuel trim PIDs, one for each side (bank) of the engine. High long term fuel trim while coasting? If it reads NO, the vehicle must be driven until the FF percentage can be learned. It's important to note that unmetered air can also enter the intake through the crankcase via the PCV system. I might reconnect the AFM to get the adaptions to ~2 and see how that looks on the o2 sensors. A rise in the water level of about 1½ in. They're fairly notorious for knackering coil packs so when I bought it I assumed swapping these our and a bit of a tune up would sort things out. High long term fuel trim at idle. Each bank has its own fuel trim reading. This value has changed with the predominant use of air-fuel ratio sensors that provide faster more accurate results on exhaust gas oxygen levels even during acceleration and deceleration. Rather, I try to encourage technicians to learn the theory of operation for their specific system and then apply the theory to the problem they are facing in their bay. I recently worked on a 2002 Crown Victoria that would start but wouldn't stay running due to a contaminated MAF sensor.
Hold that thought while we delve into the theory of fuel management. Suspicious of an intake leak, I installed my smoke machine, but the intake was not the issue, neither was the brake booster or the hose. What would cause high long term fuel trim. Fuel control provides easily understandable data that can be a valuable tool in diagnosing a drivability issue or concern. When started cold in the morning, the van cranked a long time and missed badly when it started. I've checked for induction air leaks and found one which I fixed with a replacement O-ring. The PCM calculates ethanol content after fuel is added, but only if the amount added exceeds a certain percentage of total fuel level input (FLI)—usually about 20%.
Clearing fault codes has the effect of erasing stored fuel trim data as well, and the ECU generally requires at least a few drive cycles to relearn how to adapt fuel delivery strategies. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. There is a MAF sensor installed somewhere in the air intake system between the air filter and the throttle plate. Accurate fuel control is needed to maintain the correct air-fuel ratio (AFR) that is supplied to the engine's combustion chambers for ignition. If open loop you should get a good view at the raw voltages which will be of more use.
Can you see if it is a Bosch or similar? Last but not least is a weak fuel injector and or fuel pressure. This extra pressure does what is says goes to atmosphere PSSSSH!!! MAF certainly looks like a proper it installed correctly and in the standard housing and all pipework etc? Logged this for awhile for you to see. High LTFT at Idle. - ScannerDanner Forum. I tried searching for other threads with similar issues but couldn't find anything that wasn't either a vac leak or the MAF. Please let me know what you think. While continuing to be "on the bench" every day, Jeff is also heavily involved in government focus groups, serves as an accomplished technical writer and has competed in international diagnostic competitions as well as providing his expertise as an automotive technical instructor for a major aftermarket parts retailer. Without a good understanding of each system operates, you will be wasting a lot of time diagnosing and repairing the problems that come to your bays.
Above the intake gasket, making it an easy mistake to make with carb cleaner or even propane, but not with smoke. The PCV is integrated into the valve cover and is not serviceable, so a replacement valve cover was ordered and installed. Nsa said: nevermind fuel the o2 sensors suggesting rich or lean when driving? Ideally, both values should be at, or close to 0%, when the engine is running at a steady speed, such as when it is idling. Don't have the AC running while you do this. 2 I believe which is pretty old school. Link after it was pulled out:). Thank you in advance for your help and sorry if the post was confusing at all. Long term fuel trim high at idle point. This is bad on your turbo and is called compressor surge. There is no winning here. I can't see where the hose goes either, but it seems like it goes into the intake manifold.
Further inspection showed that fuel pressure was fine, temperature was OK, it entered into closed loop and that there were no vacuum leaks present. If I pull the vacuum pipe off whilst the engine runs, causing a vacuum leak, the engine revs increase and the LTFT drops to zero. 7 in the calibration, then surely when I re-apply the original closed loop values that both my STFT and LTFT would be near 0... right? The fuel system monitor uses fuel trim tables stored in the powertrain control module (PCM) to make necessary changes to compensate for the inevitable wear and aging of the fuel system components. Positive Fuel Trim, Throttle Open At Idle. This seems to go up in line with the intake air temperature.
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