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Jerry Newton
Jerry Newton, GMC Technician
Category: GM
Satisfied Customers: 4413
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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2008 gmc acadia, # 1 cylinder misfire; exhaust valves not

Customer Question

2008 gmc acadia, # ***** cylinder misfire; exhaust valves not sealing and seat is damaged. what is the cause.
Submitted: 9 months ago.
Category: GM
Expert:  Jerry Newton replied 9 months ago.

This can be due to debris entering the engine and damaging a valve. This is unlikely unless you've had some engine work done recently, however.

Sometimes the valves just crack and little pieces break off, and this will damage the seat. Many times, there is no cause that a technician can identify, even if there was debris that caused it, that debris is typically long gone by the time the tech gets to it.

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