Old 07-23-04, 12:53 PM
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Question Help

I have a 1993 Chevy Lumina it failed the emmisions test. The failed section was, the N O the reading was 2429.2 the limit is 848.0 Can you tell me what needs to be fixed so it will pass?
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Old 07-23-04, 01:57 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
Check the cooling system for running too hot and proper fan operation.Make sure the egr valve opens and the port in the intake between the egr and throttle body is not clogged.If it is clogged(most likely) you will also have to remove the throttle body to clean it out properly.Use a stiff piece of wire a coathanger will do to poke through the clog and scrape it out.You may also wish to buy top engine cleaner to remove carbon from the cylinders also as carbon buildup also causes formation of Nox.
Old 07-23-04, 02:52 PM
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Thank you

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