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Re: is 3500ppm nox precat on a 97 cavalier too high?
Posted to Emissions Forum on 4/6/2004 66 Replies

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Kelly, I check EGR function by running our BAR 31 in concentration mode with & without EGR operating. If EGR doesn't cut NOx by at least 50% (should be closer to 70%) I go looking for EGR trouble.

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