Rich closed loop idle
Problem is the PCM is happy. It’s got everything right where it wants it to be, STFT’s are bouncing around 0, same with LTFT. Dashboard looks fine. I'm sure this is due to the camshaft overlap pushing a little O2 into the exhaust. The front O2 sensors see the O2, tell the PCM "hey were lean as hell down here" PCM dumps fuel until the sensors are happy again. Problem is that brings the AFR to about 13.75. This is measured with a 5 gas analyzer (California BAR 97 Smog Machine) I’ll bet this is a common problem and just wondered if anyone had an idea?....
Vehicle is an 02 LS1 Vette with the normal bolt on stuff. Cam is a 224/224 -114.
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