smog test

1992 CHEVROLET SUBURBAN
122,000 MILES • V8 • 2WD • AUTOMATIC
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HAD 2
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92 chev suburban 122000 miles failed nox portion of ca smog replaced egr valve got worse results on retest could o2 senser be the culpret
Aug 6, 2011 at 1:50 AM
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SATURNTECH9
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For nox i woud say look hard at the egr system you replaced the egr valve but did you make sure the egr system worked and the intake and exhaust ports to the egr were clear and not clogged?Do you have any codes?have you checked for codes yet?
Aug 6, 2011 at 2:01 AM
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