FAILED TEST

1994 GMC Safari

Tiny

christrepanier

January, 9, 2012 AT 5:52 PM

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.

FOUND 126 RELATED QUESTIONS

2 Answers

Tiny

ASEMaster6371

January, 10, 2012 AT 4:42 PM

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

Tiny

christrepanier

January, 11, 2012 AT 12:31 AM

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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