FAILED TEST

  • Tiny
  • christrepanier
  • 1994 GMC Safari
  • 198,545 miles

1994 Safari - New cat plugs wires cap rotor pcv clean oil nox high co high HC very low should be 735 is 145 New cat plugs wires cap rotor pcv clean oil.

Monday, January 9th, 2012 AT 5:52 PM

2 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,555 posts

Do you have an egr valve? With your mileage, carbon may be a factor causing the high nox.
What kind of cat did you use?

Roy

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Tuesday, January 10th, 2012 AT 4:42 PM
  • Tiny
  • christrepanier
  • Member

Problem was thermostat Stuck open engine running to cold for pcm's preference causing excess fuel problems.
Problem solved.
Thanks, very much appreciated.

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Wednesday, January 11th, 2012 AT 12:31 AM

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