Re: Vibration on Hummer
Is the check engine light on? It could be a rough idle/ misfire of a cylinder. What year is your H3? If it is a 06 you should have the heads checked.
My truck had a check engine light when I was on a trip to Reno. I used Onstar and they said it was a rough idle/misfire. It only ran rough once when I started it. I turned it off and started again and it was fine. I took it to the dealer and at first they thought it was a bad cylinder head. Ended up being a bad pcm. They reprogrammed it and everything is fine now.
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06 Slate Blue, manual, Adv. Pkg., Monsoon, sunroof, brushguard, rock rails, ucp, tow pkg, K&N intake, underhood air compressor, Warn Lights, Spider rear Diff. cover
Black Sheep Hummer Squadron
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