Quote:
Originally Posted by Celigts
Replaced the MAF with an OEM.
Same issues.
I’m running -30% LTFT at idle.
Car stalls out nearly every red light now it’s horrible.
Updated main post with parts list replaced.
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-30 means its subtracting as much fuel as it can(or close to it anyway) this is a huge red flag and one of the type of things I was talking about. This means its super rich when in closed loop.
you can monitor your short term fuel trim while you do various things such as idle, stead 2500 rpm in gear, gentle cruise at 2500, decel in gear, accell in gear etc to further isolate where the problem is happening.
Rich is both trickier to find and easier to find than lean as only a few mechanical things can cause it. Fuel pump, fuel pressure regulator, kinked return line(tho I suspect this is a returnless system), leaking injector(s), etc. Yes a bad MAF and/or primary O2 sensor can cause this too, as can a bad PCM, but these are where to start