Worn Valve Seats May Cause Engine Misfire: Hummer H3 Engine & Powertrain

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.

128 people reported this problem

57 comments

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Hummer H3 vehicles with this problem

4 model years affected

Average mileage: 94,254 miles

(33,456 - 224,450)

Repairs related to this problem

Check Engine Light Diagnosis & Testing

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Worn Valve Seats May Cause Engine Misfire on Hummer H3

Problem overview

Hummer H3 vehicles with this problem

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