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1994 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on
Ok this one has me. It came in for a intermittent rough run with CEL on. Has codes 33 MAP high and 45 rich exhaust so I started with the Map found it reading 3.6 volts @ idle. Manifold vacuum was low @ 14" repaired a small leak at #6&8 manifold gasket now I ha...
FIX posted 4/25/2015
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Message Closed w/FIX
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Related Documents & Media | VIN | 1GBKC34N4R |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection / TBI |
| Emissions | OBD1 CALIFORNIA |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always, Worse When Cold |
Trouble Codes
| 33 | Map sensor high |
| 45 | Exhaust rich |
Message Closed w/FIX
Vehicle Data
1994 Chevrolet C3500 Cheyenne
| VIN | 1GBKC34N4R |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection / TBI |
| Emissions | OBD1 CALIFORNIA |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always, Worse When Cold |
Trouble Codes
| 33 | Map sensor high |
| 45 | Exhaust rich |
Video