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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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Related Documents & Media | VIN | 1GTGC24N5M |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / tbi |
| Emissions | ca |
| Symptoms | Excessive Emissions |
| Occurs | Always |
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 |
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