NOX emission failure for 1998 grand prix gtp - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-29-2011, 10:57 AM   #1
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Default NOX emission failure for 1998 grand prix gtp

hey guys i have tried everything i have a 1998 grand prix gtp i have replaced my cat my o2s work fine i checked with a ob2 code reader my egr is opening but only on the highway any suggestions would be awesome all the other emissions passed with flying colours
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Old 10-29-2011, 11:32 AM   #2
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i think you have answered your own question, the egr is there to reduce NOX, yours isn't working properly.

Roger.
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Old 12-23-2011, 12:22 AM   #3
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roger roger!!
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Old 01-23-2012, 10:54 PM   #4
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Egr valve or crack in the erg tube. You didn't do an egr blockoff did you? <grin>
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