1994 GMC Safari Repair Question
Topics covered: Egr valve, Engine, Thermostat.
Mileage: 198,545 miles.
Mileage: 198,545 miles.
Asked on January 9, 2012
Failed etest new cat plugs wires caprotor pcv clean oil nox high co high hc very low should be 735 is 145
New cat plugs wires cap rotor pcv clean oil
Asked by christrepanierAnswer
Replied on January 10, 2012
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
Replied on January 11, 2012
Problem was thermostat Stuck open engine running to cold for pcm's preference causing excess fuel problems.
Problem solved.
Thanks, very much appreciated.