Problem Reports » Worn Valve Seats May Cause Engine Misfire

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Chevrolet Trailblazer

 

Report: Worn Valve Seats May Cause Engine Misfire

Chevrolet Trailblazer Problem
16 Reports
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Model Years Affected: 2002, 2003, 2004, 2005, 2006, 2007

Engine Affected: 4.2L 6 Cylinder

Average Mileage: 94,024 mi (54,000 mi - 164,000 mi)

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The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.

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  • Visitor, 2005 Chevrolet Trailblazer, 4.2L 6 Cylinder, 69,000 mi

    I have a burned exhaust valve in the engine. I have not had it repaired yet but I'm sure it is a valve seat issue and a known defect.

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  • Visitor, 2003 Chevrolet Trailblazer, 164,000 mi

    The truck began to have a noticable misfire and the "Check Engine Light began to blink, replaced coil packs and spark plugs on all cylinders. Still misfiring, engine light alternates between blinking and staying on.

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  • jwbarn, 2005 Chevrolet Trailblazer, 4.2L 6 Cylinder, 95,621 mi
     Rookie

    Engine mis fire code for cyl #2--leakdown compression
    check showed #2 at 15% and 200 psi, #3 at 15% and 190 psi
    Dealer removed and had valve job done on it, adv replaced
    9 broken bolts in the process. No help from GM on this
    cost me $2380.67 !!!
    No hard driving with this veh and changed oil every 4 to 6
    thousand miles, what gives????

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  • Visitor, 2005 Chevrolet Trailblazer, 4.2L 6 Cylinder, 95,621 mi

    Engine mis fire code for cyl #2--leakdown compression
    check showed #2 at 15% and 200 psi, #3 at 15% and 190 psi
    Dealer removed and had valve job done on it, adv replaced
    9 broken bolts in the process. No help from GM on this
    cost me $2380.67 !!!
    No hard driving with this veh and changed oil every 4 to 6
    thousand miles, what gives????

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  • Visitor, 2002 Chevrolet Trailblazer

    check enging light elluminated checked sparkplugs and coil pack all was good still existing

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  • Visitor, 2007 Chevrolet Trailblazer, 4.2L 6 Cylinder, 120,000 mi

    misfireing no compression on #1

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  • pos06chev, 2006 Chevrolet Trailblazer, 4.2L 6 Cylinder, 57,000 mi
     Rookie

    gas gauge not working, hard miss on #6, no one can figure out what is wrong-code says coil, injector, knock sensor, all have been replaced still hard miss

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