OBD I to OBD II Conversion Issues

autopar3000 said
You don't need an O2 sensor on each bank, I think only the HD Magnums were set up that way and I believe they're not smart enough to adjust one bank of injectors and not the other. Here's my OBD1 engine setup, for reference:

- Doug's long tube headers, with a single O2 in the right collector.
- I switch between the factory PCM and the Mopar Performance PCM, depending on whether I want to spend the money for premium fuel.
- 52 psi filter / regulator.
- Hughes SER0814ALN-14 cam and their spring kit.
- Mopar Performance M1 intake.
- 53 mm throttle body

The car runs great, so I don't think the headers or single O2 are your issue.

I don't remember, did you try disconnecting the O2 sensor? Mine went bad a little while ago and the car ran like garbage, but when I unplugged the O2 it was fine - just running in open loop, so way rich.

Thank you for explaining your set up. Our exhaust systems are similar, and if yours is working properly I don't think having one O2 sensor in the right bank is causing the issues I'm having. I do think having an older O2 sensor could be the problem, so I might replace it later.
Yeah, this system is relatively crude in it's ability to make fuel trim adjustments based on O2 sensor input. The O2 sensor or sensors are more or less monitors of exhaust condition and catalytic efficiency.
I unplugged my O2 sensor because it was getting a trouble code for high signal voltage, and it ran just as bad as yours did. I thought the high voltage was from how the signal wire was routed when I had the harness apart. I rerouted it and still have the same problem. More troubleshooting to follow.