Emmissions test

1994 CHEVROLET SUBURBAN
185,000 MILES • V8 • 4WD • AUTOMATIC
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GERALDGAB
  • MEMBER
  • 1 POST
test failed on low RPM- high RPM passed Hydrocarbons is the issue- for test car ran for 45 minutes- took to my mechanic he could not find anything wrong- runs great had a tuneup 2 months ago- what is next step?
Feb 3, 2016 at 5:46 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check for a vacuum leak under tbi unit if that is what you have, also make sure intake bolts are tight if you have pfi. then change oil, filter, air filter drive for 20 mi eway then retest
Feb 4, 2016 at 6:01 AM
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