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Make Sense Of Long Term Fuel Trim

So what does this mean? 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. I had ta similar experience on my Alpina a few years ago. I think at 9 you should get a CEL. Long term fuel trim high at idle meaning. 7) is correct, as is the IAT. It was popping and gurgling a bit more though which would indicate the engine running rich (I think - is this right? )

Short Term Fuel Trim At Idle

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 am starting to see purge solenoids that will leak vacuum after they have passed the actual OBD-ll purge leak test, and will be closed when you are testing them. Long term fuel trim high at idle speed. Since all MAF sensors do not fail in the same way, it is impossible to say the trims will show specific things, such as "short term trims will follow throttle position". 9 volts, which the ECU interprets as changes in the oxygen content of the exhaust stream. Thats where you get your +/-% for STFT. Try putting the stock fuel trim settings back and see if that works better.

Long Term Fuel Trim High

Years of experience have taught me that diagnosing these codes can be as easy as opening the hood and hearing the hissing sound of unwelcome air entering the engine through a cracked hose, or as difficult as buying boots to match your wife's favorite jacket. I also ran some Seafoam through the gas tank a few times. I'd love as much help as you can provide. I tried everything, I even made my own smoke machine to see if I could and find the trouble spot myself. Vacuum leaks on a speed-density engine are not unmetered air and do not cause a shift in fuel trim. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. Also the weather is considerably cooler then when I last tested. And you will notice that the rich periods perfectly match the S02. That's quite high, IIRC, and it's also normal for my car at idle and matches exactly what it normally shows, from before this problem developed. I believe that during idle, the BPV can be slightly open, so plugging it could cause the MAP to behave like it did. Thank you all for your responses.

Long Term Fuel Trim High At Idle Meaning

And that's not the only way a mistake can be made. There is a MAF sensor installed somewhere in the air intake system between the air filter and the throttle plate. At cruise, the Ranger hardly noticed the exhaust was plugged. What does high long term fuel trim mean. Both the mass airflow and speed-density systems calculate the weight of the air that enters the engine. I have looked for a vacume leak using brake cleaner and smoke in the engine. Further inspection showed that fuel pressure was fine, temperature was OK, it entered into closed loop and that there were no vacuum leaks present. Stevieturbo said: And presumably this hasn't happened overnight?

High Negative Long Term Fuel Trim At Idle

Previous owner has fitted a new fuel filter which would be my next port of call - spark plugs and coils were also reported as changed by the last garage but were clearly not when inspected - hence I changed these. Long post I know, but also I found what I'm pretty sure is metal bits before the intercooler coupler. To get full-access, you need to register for a FREE account. As load increases it will go down, sometimes even briefly negative. I really don't know how, but somehow the existing new one was either bad/fake or because faulty. The lambda is going rich but the injector duration is not changing. To determine if this is the case, first verify that the FF learned (FF_LRND) parameter reads YES. Fuel trim for diagnostics | Vehicle Service Pros. If the engine stumbles / runs rough, its airtight. A scan tool was used to graph data from both vehicles and each vehicle was driven with a restricted exhaust, then each vehicle had a vacuum leak induced so the scan data would show how each fuel management system reacted to the same problem. Vacuum leaks will also not cause a P0171/P0174 code. But is the cause of a P0171 the same thing on a Ford 5. I let it idle for 30 minutes, and within the first minute the LTFT was already starting to post negative values and kept going negative until it hit the lower limit that I set to -15%. When using propane enrichment, slowly move the propane source along all likely vacuum leak locations while monitoring the O2 sensors.

Long Term Fuel Trim High At Idle Pressure

Do you have a code scanner that can read live data, if so the air flow should be in there somewhere. The car ran OK on the highway, but the customer wasn't happy about the idle and stalling issues. This item is critical. 8 LUW, 102, 000 miles. High LTFT at Idle. - ScannerDanner Forum. The maf was changed by the previous owner a year ago when the air-oil separator was changed by clearly a slightly dodgy garage - those plugs should have been 3montys old and the coils were clearly not new. Are you faced with a customer's vehicle performance concern? As you can see, within only a couple of minutes the AFR's went back to cycling between ~15 AFR and ~12AFR as you can see in the logs.

Another place these have an issue leaking is the intake hose itself, especially where it connects to the turbo inlet. The Vac line on your BPV is hooked to a spring and diaphragm inside. The AFR's never cycled once and essentially stayed completely stable for the whole duration of this datalog. Short- and long-term fuel trim. But then I went out tonight to do a very jenky DIY smoke test, I tugged on the BOV vacuum line and it came right out from underneath all these other hoses!
Fri, 17 May 2024 05:45:23 +0000