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03 GC Cylinder Misfire OBD Codes


 
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jaredhusketh
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Joined: 16 Jan 2007

PostPosted: Tue Jan 16, 2007 8:08 am    Post subject: 03 GC Cylinder Misfire OBD Codes Reply with quote

I have a 03 GC with the 4.7L and Quadra-Drive. Few months ago, MIL light came on registering "Large EVAP Leak" code. Took to dealer, replaced Leak Detection Pump. MIL light came on within 50 miles, dealer lowered gas tank . 200 Miles later, MIL light on with P300, P305, P307 "Misfire in Cylinder 5 and 7" Code.

Any thoughts? Definately not the plugs and wires, maybe the coil pack gone bad? Heard some people had results with cleaning out the valves and manually rotating them. Also heard problem could be associated with exhaust not leaving the chamber/leaving too fast.
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