1990 GMC FAILED CALIFORNIA SMOG

  • Tiny
  • linvdan
  • 1990 GMC

Engine Performance problem
1990 Other GMC Models V8 Four Wheel Drive Automatic 246000 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

Tuesday, August 19th, 2008 AT 6:51 PM

1 Answer

  • 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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