1991 GMC C2500 Sierra 7.4L Excessive Emissions
i think i am missing somthing on this one. it failed for high nox so i started checking the egr valve. the valve was getting no vaccum off idle and cruise on the dyno. vaccum to the solenoid is 14 inches and out of the solenoid is 0. i can feel a small pulse o...
FIX posted 9/21/2005
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Message Closed w/FIX
Vehicle Data1991 GMC C2500 Sierra
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Message Closed w/FIX
Vehicle Data
1991 GMC C2500 Sierra
VIN | 1GTGC24N5M |
Engine | 7.4 L / 8 cyl / GAS |
Trans | 4-speed Automatic |
Delivery | FI / tbi |
Emissions | ca |
Symptoms | Excessive Emissions |
Occurs | Always |