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am seeing 20.3 + ltft at idle closed loop yet mpg is 25 hgwy and 18-20 city every gasket and inj seals have been replaced 20 in. man vac measured after throttle body is this a subaru thing? car idles rock steady,power is good, no driveability issues.car has 202000 miles maintained well more than most,retired master tech,anyone got any ideas?or are 3 separate scan tools lying to me/
Positive 20 LTFT certainly sounds like too much trim, but it is only part of the picture.
Each bank should have its own LTFT and STFT.
What is the short term at that time?
If it's negative 15 for example while long term is positive 20, then there's really only total trim of positive 5, which is perfectly reasonable.
Does the LTFT improve off idle, and what is short term doing at that time?
ltft improves some at 2000 rpm stft at 2000 is -8.0 more or less am only looking to max fuel economy .i have a local tuner for subaru and evo who can remap maf rescale ,inj pulse time and duty % do u think its possible to get closer to 30 hgwy mpg or am i wasting time and money just be happy with 25 hgwy?
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