Worn Valve Seats May Cause Engine Misfire on Hummer H3
Problem overview
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.
127 people reported this problem
56 commentsHummer H3 vehicles with this problem
3 model years affected
Average mileage: 93,430 miles
(33,456 - 224,450)
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