Hi, so I did a little trip just now, and took notes of LTFT and STFT. Was hoping for your wisdom and opinion.
ECM1 LSFT:
ECM2 LSFT:
Misfire range:
The STFT was during warm idle between 0 and -3%. During pull(and misfire) it was ranging between -7% and -11% on that one bank.
What are engine healthy numbers? Specially during load/rpm, do you know?
PS: All the sparkies had quite a bit carbon on them, but since i recently took over the car, I cant tell for certain it is due to running rich or simply if the previous owner did ALOT of small trips and such.
Just doing some thinking out loud, do correct my logic if it is indeed flawed.
All 10’s appear to run rich, if the fouled sparkies is indeed a symptom of that, and not small repetative driving. So if the sparkies confirm the rich condition, that suggests O2’s are operational.
Now if the fuel rail were leaking, sparkies wouldnt be fouled either, so ruling that out. Leaking fuel injector? Surely a possibility, but all 10 of them? Improbable.
What affects all 10’s somewhat “equally?” Manifold leak? A vacuum leak should cause a lean condition no? So not that.
So, potentially defect MAF? Could indeed cause all 10 to run rich, but why the variance between the banks? Only thing I can think of is, either MAF/Carbon Buildup causes rich condition, whilst Cyl2 has restricted airflow, potentially a broke flap piece jammed in the valve, which then corrupts the readings on the bank? As far as I can tell thats one of the few explianations.
Think I will buy a boroscope and shove it in, see whats what inside. Thoughts?