Brad:
My brain is working again. I recall a similar problem on my 2002 Z-28. I had closed-loop enabled, but an O2 sensor read bad (too high) and by default it went into open-loop.
The difference was I got a DTC. I also have the front O2's set to 2 trips, Emissions-Related on all the Engine DTC Processing Enablers. In other words, all my C6001 Enablers are still stock.
I bet you are not getting a code since a lot of yours are set to 'Not-Reported'. I am 99% sure that a bad O2 will put you into Open-Loop Fault..
Anybody else have any ideas?
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