Car Problem Reports

GMC 1500 Pickup Worn Valve Seats May Cause Engine Misfire

GMC 1500 Pickup Problem
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Model Years Affected: 1996, 1997, 1998, 1999

Engine Affected: 5.7L V8


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.

  • Visitor, , 5.7L V8, 135,000 mi

    check engine light won't go out. Po300 and PO306. Engine runs smooth. Did full tune up-cap, rotor, plugs, wires, even replaced 02 sensor and all fuel injectors. Code still on but truck runs fine

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