Quote:
Originally Posted by Tom keedle
as i read all this i'm reminded of some classes/training i've took over the years......when you go WFO, oem stuff IS in open loop.
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You are absolutely correct Tom. P.E. (Power Enrichment) mode is Open Loop. Closed loop target air/ fuel ratio is always 14.7-1 unless they have a Lean Cruise Mode. Then usually over 15-1 or leaner. Those are normally "Export" calibrations, as the cats used now are not efficient that lean. Most factory calibrations are actually overly rich in P.E. mode. Richer than we run our cars. Most GM calibrations are closer to 12-1 from the factory.