Engine Misfire Due to Worn Valve Seat on GMC 3500 Pickup

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Our technicians tell us the misfire may or may not be felt while driving. They further recommend that both cylinder heads be removed and thoroughly inspected and repaired as necessary.

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Average mileage: (–)
Engine affected: 5.7L V8
4 model years affected: 1996, 1997, 1998, 1999
4 people reported this problem
0 people shared problem details
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