Quote:
Originally Posted by projectbarnie
STFT is -21 during WOT
At idle in D STFT is near 0 and LTFT is at +14
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So at idle the DME is adding 14% extra fuel to hit stoich for the amount of air the cylinders are getting. Then at WOT it has to cut fuel, as it's getting too much fuel for the air in the cylinders. The intake tends to be under vacuum at idle, and obviously under pressure at boost. Maybe a boost leak somewhere letting in extra air at idle (sucking extra air in that wasn't counted by the MAF under vacuum), and leaking air out under boost (loosing air that was counted by the MAF)?