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1994 GMC K1500 Sierra SL 5.0L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on
This truck is running rich. Map sensor when idling is 2.4 volts, should be below 2 volts. I've tried new Map sensor with no results, new ECM, nothing changes. I can manually put a vacuum on MAP sensor and bring down to 1.6 volts and truck runs great. I also re...
FIX posted 2/28/2009
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Related Documents & Media | VIN | 1GTEK14H4R |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / TBI |
| Symptoms | Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 33 | MAP high voltage |
Message Closed
Vehicle Data
1994 GMC K1500 Sierra SL
| VIN | 1GTEK14H4R |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / TBI |
| Symptoms | Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 33 | MAP high voltage |
Video