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Chevrolet Trailblazer Worn Valve Seats May Cause Engine Misfire

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

Engine Affected: 4.2L 6 Cylinder

Average Mileage: 101,348 mi (54,000 mi - 171,000 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.

  • Visitor, , 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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  • Visitor, , 72,000 mi

    misfire in #6 cylinder. replaced fuel injector, coil, spark plugs. inspected by 4 mechanics and agree vehicle needs valves replaced. lowest quote is $1800. I know of 3 other Trailblazer owners that have or is experiencing the same thing.

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  • jwbarn, , 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, , 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, , 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, , 4.2L 6 Cylinder, 146,000 mi

    Misfire in the engine, check engine light displayed...Spark plugs, coil packs replaced only to need deep diag. done at Chevi place and #2 cylinder bad...Need NEW MOTOR..

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  • pos06chev, , 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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  • hank 51, , 4.2L 6 Cylinder, 113,000 mi
     Rookie

    had blowby in airbox intake engine idiling rough loose or worn valve stem seats had head rebuilt solved problem

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  • Visitor, , 4.2L 6 Cylinder, 88,000 mi

    Cylinder 3 misfire at idle. Low compression on this cylinder

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  • Visitor, , 4.2L 6 Cylinder, 94,259 mi

    Check engine light came on. Mechanic's diagnostic was valve #1 had to be replaced. Had it replaced but check engine still came on, now i find out that the whole cylinder head has to be replaced.

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