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Re: is 3500ppm nox precat on a 97 cavalier too high?
Posted to Emissions Forum on 2/13/2004 21 Replies

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What do you consider "slightly lean"?

I've fixed MANY NOx problems on non-EGR Asian 4-cyl's by O2 sensor replacement, bringing Lambda from 1.020-1.030 back down around 1.000 and cutting pre-cat NOx ... Login to read more.

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