2001 GMC Sonoma Failed NO test

SCHERZBIT

MEMBER
2001 GMC SONOMA
6 CYL
2WD
AUTOMATIC
105,000 MILES

I have to get my vehicle smogged, but it failed the NO test. It passed all the other test easily. I hadn't driven it very far before the test, but the smog test tech said since it passed everything else, the cat converter is probably already working. Is there any quick fix for this? I just want to get it passed this one last time.

3 Replies

RACEFAN966

MECHANIC
5,029 POSTS

Ok so let me ask a few questions here to try to help. Now when was it tuned up last? How old it the fuel filter? Has the oil been changed recently? Also put some seafoam in the gas tank. Get back to me and we will take it from there.

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Thursday, March 26th, 2009 AT 10:45 AM

SCHERZBIT

MEMBER
4 POSTS

It hasn't received any changes to oil or fuel filter with the last 3000 miles, and probably longer for the fuel filter.
What is seafoam?

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Thursday, March 26th, 2009 AT 2:24 PM

RACEFAN966

MECHANIC
5,029 POSTS

Ok I would change the fuel filter if it has been more the a year sense it has been changed. If the oil is dirty or looks dirty then change it. Seafoam is a fuel and oil additive that cleans injectors and the fuel system and works great. Let me know how it goes.

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Friday, March 27th, 2009 AT 10:24 AM