Smog test

HAD 2

MEMBER
1992 CHEVROLET SUBURBAN
V8
2WD
AUTOMATIC
122,000 MILES

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

Saturday, August 6th, 2011 AT 1:50 AM

1 Reply

SATURNTECH9

MECHANIC
30,869 POSTS

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?

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