1989 Chevrolet Silverado New Exhaust Pipes Catalytic Converters 2 Went

1989 CHEVROLET SILVERADO
69,000 MILES
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POOLSHOT
  • MEMBER
  • 1 POST
New exhaust pipes, new catalytic converters(2) went to inspection for emissions test.Failed hydrocarbons and Canon monoxides. Mechanic checked motor and can't understand why it didn't pass. Thanks for some help?
Feb 27, 2013 at 5:17 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
first you need a new mechanic

could be a bad o2 sensor, plugs worn out, oil contaminated with fuel.


it will have to be examined by someone who has knowledge of the gases.

Roy.

Feb 27, 2013 at 7:47 PM
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