Quote:
Originally Posted by lippy
If you have a big cam with lots of overlap, you won't be able to run EFI in closed loop mode because the oxygen sensor can't get a good reading with significant unburnt fuel passing through the engine at lower RPM.
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It think it is more the oxygen, causing a false lean reading. I have not done this, but the tuners tell me to target a lean AFR at idle to get the desired actual AFR.