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Re: 1990 Lumina 3.1 single wire O2 at o volts
Posted to Technical Discussion Forum on 7/22/2005 3 Replies

I think you have a problem with the reference ground that the ECM uses for the O2S. I'm swamped right now, but I've fixed this problem on other GMs and that's what it was.

Brian Login to read more.

3 Replies Received (View Replies)