Fuel Trim: Finding A Vacuum Leak And Performance Issues Using Fuel Trim Data | Auto Service Professional — Use The Drop-Down Menus To Complete Each Sentence. - Gauthmath

July 5, 2024, 12:42 pm

At idle, my long term fuel trim reads 7. 7 2500 RPM- STFT: 32. Mash on pedal>turbo spools up adds pressure to you intake and hoses. Quote: |07-03-2020, 02:07 PM||# 3|. What else can I check? But fuel control is often misunderstood and not used properly. Turn of the damn fans next to you an pressure the system up. That was due for a replacement anyway and I put in a new (OEM) one, to no effect. The AFR's never cycled once and essentially stayed completely stable for the whole duration of this datalog. But when the engine is in boost mode and positive pressure is provided in the intake, the vacuum leak will allow boost air to escape. Positive Fuel Trim, Throttle Open At Idle. Don't disable it, unplug it. Unless many recommend a more sensible normal type plug from NGK or Denso. I have tried with every possibility including the stock values.

Long Term Fuel Trim High At Idle Air

Getting as close as possible to freeze frame temp is very important. As a rule of thumb, numbers greater than "1" indicate a lean mixture, and numbers greater than "1"indicate a rich mixture. Propane enrichment also works well and usually takes less time. The speed-density method of fuel management achieves the same end result as the mass airflow strategy but the route taken is much different. 7 while bank 2 was steady at 3. Everything is near perfect, especially idle hovering dead on at 14. Even some in-line four cylinders have two sets, one per cylinder pairing (cylinders 1-4 and cylinders 2-3 t ypically). Exhaust restrictions can set a P0172/P0175 (System Rich: Banks 1 and 2)) codes on some vehicles, depending on how the sensor software is written. Long term fuel trim high at idle low. •Let it stand for about two minutes. While fuel trim values of 0% would be ideal, there is no such thing as a perfect engine, which means that in practice, achieving 0% fuel trim values consistently gets progressively more difficult as an engine ages. There are two types of fuel trim – short term (STFT) and long term (LTFT).

High Long Term Fuel Trim At Idle

You'll understand why below. It also greatly increases the risk of fire. Motor is lumpy at idle, and a bit reluctant to rev. Location: QUEENS NYVehicle: 06 Fxt. Overall I believe the issues are very related, and it seems that the closed loop operation is confused by not following the STFT numbers.

Long Term Fuel Trim High At Idle Low

Going to the dealer on Friday, since the mechanic is no longer returning my calls -__-. Long term fuel trim high at idle start. This gives the illusion that the MAF must be at fault but it's still an air leak somewhere. 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 engine is the 4. Car was stumbling and stuttering for a while with +10 LTFT and a low MAP.

Long Term Fuel Trim High At Idle Start

In the European world, these terms are known as additive for STFT and multiplicative for LTFT. 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. 0 tsfi, ltft at IDLE=13. NOTE: Many manufactures are also using rear fuel trim to further fine-tune their fueling strategy. You want to see the big picture. They provide input on air entering the engine and the state of the exhaust gasses. If it is a MAP engine only, a vacuum leak would normally cause a high idle speed. Must admit, I hate multi-pronged plugs! Make sense of Long term fuel trim. It's such a common mod that it can't affect all cars, as are the RS engine mounts, but maybe the balance of my engine and these bits worked out wrong? Unless there is something to route it otherwise it heads back towards the turbo ((cold side) on the blow side (exducer), not the suck intake side (inducer)). The fuel system monitor also relies on inputs from the engine coolant temperature (ECT) or cylinder head temperature (CHT) sensor, the intake air temperature (IAT) sensor and the mass airflow (MAF) sensor in order to activate the fuel trim system, which in turn activates the fuel system monitor.

Long Term Fuel Trim High At Idle Sensor

I had ta similar experience on my Alpina a few years ago. High LTFT at Idle. - ScannerDanner Forum. 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. Since the driver controls airflow (load) with the accelerator pedal, the ECU can only control fuel. Edited by shalmaneser on Wednesday 18th November 09:27.

Should have tried this trick sooner, but I was to focussed on other issues and I knew the AFM had just been replaced so wrote it off as a potential failure point. It's best to get a hose adapter for your propane tank. I have taken a series of live data photos, starting with the engine off, then cold through to hot and then at higher RPMs on a hot engine. It sounds like you could have an exhaust leak that is causing in this to happen. Long term fuel trim high at idle sensor. That mist goes everywhere. MAF reference values are also tricky because they vary so much depending on the application. Let's look at some possible causes of the lean codes. The car obviously stumbled when I popped the connector off, but quickly returned to "normal" and back to the 12-15AFR swinging. My point is that the closed loop function is working severely incorrectly at idle.

But this feature can go bad if the PCM doesn't know it's burning E85.

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Use The Drop Down Menus To Complete Each Sentence

Is the drop-down list being used to list previous user input? Give the coordinates of…. Verb agree: computer or subject: phone. 2 is meeting after school on Monday.

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