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Emmissions test

Tiny
GERALDGAB
  • MEMBER
  • 1994 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
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?
Wednesday, February 3rd, 2016 AT 5:46 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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
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Thursday, February 4th, 2016 AT 6:01 AM

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