2001 GMC Sonoma Failed NO test

2001 GMC SONOMA
105,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
SCHERZBIT
  • MEMBER
  • 4 POSTS
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.
Mar 26, 2009 at 8:58 AM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 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.
Mar 26, 2009 at 10:45 AM
Avatar
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?
Mar 26, 2009 at 2:24 PM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 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.
Mar 27, 2009 at 10:24 AM