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2003 GMC Envoy SLT 4.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on
when driven for 2 or more hours will clear up but gas mileage is at 15mpg cruise control some how seems to be affiliated with it is running at optimal temp suspect possible short but all connections seem good even ran injector cleaner no avail
FIX posted 3/16/2014
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Message Closed w/FIX
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8 Replies Received
8 Replies Received
Related Documents & Media | VIN | 1GKDT13SX3 |
| Engine | 4.2 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp On |
| Occurs | Cruise, Idle, Intermittently |
Trouble Codes
| P0301 | Cylinder 1 Misfire Detected |
Message Closed w/FIX
Vehicle Data
2003 GMC Envoy SLT
| VIN | 1GKDT13SX3 |
| Engine | 4.2 L / 6 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp On |
| Occurs | Cruise, Idle, Intermittently |
Trouble Codes
| P0301 | Cylinder 1 Misfire Detected |
Video