Car Problem Reports

Jeep Grand Cherokee Misfire due to carbon build up on exhaust valves

Jeep Grand Cherokee Problem
4 Reports
Me Too

Model Years Affected: 2000, 2003

Engine Affected: 4.0L 6 Cylinder

Average Mileage: 108,000 mi (104,000 mi - 114,000 mi)


4.0L 6 Cylinder
Due to misfires, you may experience a loss of power when accelerating between 50 and 70 MPH (most noticeable below 32° F). This is commonly caused by carbon buildup on the valve stems, as a result the exhaust valves may close too late. All of the exhaust valves should be inspected and if necessary the engine should be decarbonized.

  • Visitor, , 4.0L 6 Cylinder, 106,000 mi

    engine misfires in cold temperatures when heavy load is put on engine at highway speeds, also changed plugs and coil pack, did not help. still looking for help

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  • Visitor, , 4.0L 6 Cylinder, 114,000 mi

    every once in a while, ill be traveling at highway speeds and my jeep just "jerks" kind of like shifting it from drive to N and back to drive really fast. i put some marvel mystery oil in the oil and gas and it has made it better but it still happens every once in a while.

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  •  Rookie

    The temp was about 41 degrees and I was hawling my boat back home and the engine light kept coming on and the car was jerking.

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