I can't make sense of this. These readings are from an operating temp engine in neutral.
My STFT on both banks is around +20%
My LTFT on both banks is around -15%
Symptoms are low idle rpm, especially when the car warms up. Flickering red oil light, although it likes to stay on after the car has thoroughly warmed up. Slightly rough startup as well. All these symptoms suggest an air leak, but why the negative LTFT's?
Just tried a smoke test, no indication of leaks. Switched out MAF sensor with a different one, same readings, no change in symptoms. Haven't done anything with the fuel filter.
Any ideas?
My STFT on both banks is around +20%
My LTFT on both banks is around -15%
Symptoms are low idle rpm, especially when the car warms up. Flickering red oil light, although it likes to stay on after the car has thoroughly warmed up. Slightly rough startup as well. All these symptoms suggest an air leak, but why the negative LTFT's?
Just tried a smoke test, no indication of leaks. Switched out MAF sensor with a different one, same readings, no change in symptoms. Haven't done anything with the fuel filter.
Any ideas?
Way positive and way negative fuel trims...
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