1990 Other GMC Models Failed California smog

Tiny
LINVDAN
  • MEMBER
  • 1990 GMC
  • V8
  • 4WD
  • AUTOMATIC
  • 246,000 MILES
I just failed CA smog, my HC levels are as such
Idle- RPM- 1062, HC measures 173
2500 RPM- HC measures 400

What should I do to correct this? Truck seems to run fine.
Thanks
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Tuesday, August 19th, 2008 AT 6:51 PM

1 Reply

Tiny
JACK42
  • MEMBER
At that mileage, it could very well be the cat converter is all used up. They are a reactive material and will only last so long
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Friday, August 22nd, 2008 AT 12:19 PM

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