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FIX GM Nox/Negative Backpressure Smog Failure
Posted to Technical Discussion Forum on 11/8/1999

Well, the car was still at the shop this morning. They had retested it on Sunday. The Co had gone to zero % and the Nox had dropped to within 70 PPM of passing.

I phoned a fellow that does a large number of smog failures. We went over everything that had bee... Login to read more.