I'm just getting started with tuning, but I'm having an issue that's keeping me from getting the basics done. For some reason my B1 O2 isn't oscillating, and it's reading off the charts. I swapped in a new with the same results. The car runs great till it goes closed loop, then bank 1 goes way rich. Any advice on what to check would be greatly appreciated.
Car has LS6 Stage 2.5 heads, MS3 cam, Long Tubes w/cats, LS6 intake.