
2003 GMC Envoy XL SLE 4.2L Poor Idle Quality, Misfire, MIL Lamp on
This truck came in with the check engine light on with a p0306. At first customer said he wanted a tune up but realized that the misfire should be checked first. I swapped coils and plugs and miss remained on #6. Put a vacuum gauge on it and had a nice steady ...
FIX posted 1/30/2010
![]()
iATN Members:
Login to view full TechHelp request Auto Repair Pros: Join iATN to read this TechHelp request Vehicle Owners: Find a nearby iATN member to repair your vehicle (View Replies)25 Replies Received(Hide Replies)25 Replies Received
|
Message Closed w/FIX
|
VIN | 1GKES16S63 |
Engine | 4.2 L / 6 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | FI |
Emissions | OBD-II Compliant |
Symptoms | Poor Idle Quality, Misfire, MIL Lamp On |
Occurs | Always |
Trouble Codes
P0306 | Cylinder 6 Misfire Detected |
Message Closed w/FIX
Vehicle Data
2003 GMC Envoy XL SLE
VIN | 1GKES16S63 |
Engine | 4.2 L / 6 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | FI |
Emissions | OBD-II Compliant |
Symptoms | Poor Idle Quality, Misfire, MIL Lamp On |
Occurs | Always |
Trouble Codes
P0306 | Cylinder 6 Misfire Detected |