There are two types of fuel trim – short term (STFT) and long term (LTFT). Make sense of Long term fuel trim. Side note: I attempted to re-configure every known value relating to fuel/trims/etc in order to trick the system into getting around this issue. You want to see the big picture. Just to be clear - that's unplugging the battery, de-juicing it with the brakes, waiting, and then the combination of on for 29 seconds, start, idle for 20 mins?
Long Term Fuel Trim High At Idle Power
I'm with what was said above about returning the car to the shop who did the smoke test. But when I was disconnecting the recirculating hose off the bypass valve, I noticed that there was a 2-3 inch tear in the end that connects to the BPV. Each bank has its own fuel trim reading. But because all that air isn't being supplied into the cylinders, the PCM is supplying too much fuel, creating a rich mixture. Fuel trims to correct a rich or lean condition. Errors in the actual MAF sensor output (bad sensor ground, contaminated hot wire/film, and the like) will show up with a lower than normal load PID value, the long term and short term fuel trim data will also point to the error in air calculation dependent on the MAF fault. If you do hold it under the intake—a good place to check for leaks—give the area a good shot with shop air to blow out any residual propane when you're finished. The complaint may be accompanied by a trouble code and an illuminated SES light, a performance concern or a combination of both. That pre-programmed injector pulse will provide exactly enough fuel to establish a stoichiometric air/fuel ratio, however the ECU will adjust injector pulse width to provide more or less fuel than specified in the map. What would cause high long term fuel trim. Thats where you get your +/-% for STFT. The code retrieved from the PCM was a P0420, a catalytic converter efficiency code.
Both the mass airflow and speed-density systems calculate the weight of the air that enters the engine. The PCM uses sensors in the exhaust that will report whether the desired AFR was attained (this is fuel control) when it is in closed loop. Faulty MAFs even from genuine manufacturers aren't unheard of though so if you're confident you've no more leaks I'll keep my fingers crossed the new one fixes the problem! I reset the fuel trims (I used a factory scan tool to do this, but disconnecting the battery will do the same) and road tested the car to verify. The odometer shows 140, 000 miles have slid by under the vehicle. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. Meaning that the possible exhaust leak is causing the sensor to read a lower AFR at idle?
Long Term Fuel Trim High At Idle Control
So then I suspected MAF or other input air sensor failure. Don't clear the DTCs yet. This adjustment is called fuel trim and can be read using a scan tool. MAF certainly looks like a proper it installed correctly and in the standard housing and all pipework etc? A rich condition will cause the engine to run with a hesitation or have a nasty smell at the tailpipe and could be caused by spark plugs that are fouled out, a fuel injector that is leaking, or a fuel pressure regulator is stuck on high pressure. 07-03-2020, 10:29 PM||# 5|. Other than that, the tune is identical in FlashPro. If nothing appears cracked, beaten, abused or misused, the next step is to determine if the lean condition is caused by a vacuum leak. Long term fuel trim high at idle control. Al fuel trim is determined by adding STFT and LTFT from the same bank. In fact, fuel trim values offer insights into the overall condition of the engine and fuel system in ways that few other diagnostic methods can match, so use them to your advantage.
With a man-made exhaust restriction in place, the Ranger exhibited low power and the only PID that changed was the LOAD PID, reading 74 percent when it should be reading closer to 95 percent. This extra pressure does what is says goes to atmosphere PSSSSH!!! Even some in-line four cylinders have two sets, one per cylinder pairing (cylinders 1-4 and cylinders 2-3 t ypically). I would REALLY appreciate your help into a more thorough review of this matter. There is no winning here. The bottom is connected to the intake pre-throttle body post-turbo, and the top is connected to the intake manifold. Positive Fuel Trim, Throttle Open At Idle. It's important to note that unmetered air can also enter the intake through the crankcase via the PCV system. It uses sensors to measure or calculate airflow, consults an air/fuel ratio map in its permanent memory, then chooses the correct injector pulse width (the amount of time the fuel injector will stay open) to match that airflow. However, the signal voltage from the downstream sensor should remain fairly constant around the mid-point of the voltage range that applies to that sensor, provided the catalytic converters' efficiency is at about 75% or higher. I don't see any problem being resolved here.
What Would Cause High Long Term Fuel Trim
Notice how the STFT, LTFT and O2 PIDs reacted. But engine wear, faults and parts issues can occur throughout its operational life, and when this happens it will affect these calculations, so adjustments need to take place. Will continue investigations if the mood takes me. If the HO2S indicates the engine is running lean, the PCM corrects the lean condition by moving the STFT into the positive range, adding more fuel to correct for the lean condition. Long term fuel trim high at idle meaning. I noticed the previous owner fitted a new MAF - could this be a poor copy? Location: SE MI/SE WIVehicle: 2005 LGT. The MAP value normalizes with the AC turned on all the way, and the STFT plummets down to like -8%.
You can use a can of carb cleaner/brake cleaner and gently spray around gaskets and hoses while the car is idling. Letting go drops it to 1. And check the cam deviation reading (only on bank 1 on an early car). A significant decrease in STFT or LTFT from 0% means the ECU is detecting less air than expected and is adjusting fuel delivery with less fuel. I really don't know how, but somehow the existing new one was either bad/fake or because faulty. 5 and the LTFT sits around 9. Unless many recommend a more sensible normal type plug from NGK or Denso.
Long Term Fuel Trim High At Idle Meaning
Isolate components by blocking vacuum hoses, either by removing and plugging them, or by crimping them off. The car ran great again at idle and partial throttle, and was hitting the target AFR's in every cell. This is a consistent reading I'm getting over the span of two days. After the repair and after clearing keep-alive memory (KAM), the fuel trims shot right back up. 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. The added fuel is there to keep you from running lean given the current situation. A software update is available for the ECU to suit replacement MAF voltages (a decent specialist should be able to do this). The LFTF value is stored in memory and "learns" from the STFT. Poor fuel quality can also cause a lean condition that could have you ready to throw in the towel. My car has 165000 miles. Sometimes auto repair is done with smoke and mirrors.
The speed-density method of fuel management achieves the same end result as the mass airflow strategy but the route taken is much different. The vehicles that come to our shops use one of two types of fuel management strategies: speed-density or mass airflow as measured by the mass airflow (MAF) sensor. Location: QUEENS NYVehicle: 06 Fxt. Still full after 1000 miles) plus some Lucas Oil Stabilizer. If closed, unless it has very fast logging, what you're seeing in terms of voltages wont be much use ( assuming the o2's are switching correctly and CL is operating correctly)I'll check whether the car is open loop or not with the MAF unplugged, I suspect it's open as you say. I tried searching for other threads with similar issues but couldn't find anything that wasn't either a vac leak or the MAF. Such as hoses and injector orings. Nowadays, the biggest issue with fuel quality is the addition of ethanol. Rich codes and the drivability issues that accompany a rich running condition would be reflected with negative fuel trim numbers: an indication the PCM is subtracting fuel. There's no reason the ECU should be pulling any fuel at idle if the base map is set perfectly so that it idles at 14.
Lean conditions will cause the engine's temperature to rise and could be caused by either a loss of fuel pressure or the injectors are not spraying properly. Notes: - All tests were done fully warmed up with IAT's and Coolant temperatures at 0% fuel compensation. Going to the dealer on Friday, since the mechanic is no longer returning my calls -__-. •If the water test and FF_INF do not agree, clear keep-alive memory and road-test until the FF_LRND value registers YES, and the FF_INF value is correct.
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