My old Malibu did the same thing, so did my G6 I had before. Both were 3.6's. Dealer told me on both occasions it was normal.
Engine shudder in 08 LTZ w/ 3.6
I have an 08 LTZ 3.6 that's having a mild shudder while idling. The best way I know to describe it is it's as if the engine is out of balance, if that can even happen. It's not a vibration, but "soft" shudder. It is worse when idling in "D"rive, such as at a stop light, than in "P"ark, but isn't at all noticeable during acceleration or cruising. There is no drop in RPMs or error messages in the DIC. I have looked through some of the threads here, but none of them seem to encompass my issue. I just bought this car a month ago and have it under the GMPP Major Guard Warranty, but I would like to be armed with a little knowledge of this issue in case the dealer tries to tell me they can't replicate it or claim it's normal. Thanks for the help guys!!!
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Sounds to me like you have the common Malibu vibrations. Not really related to this thread. See the big sticky in Problems/Service....Hey I wanted to bump this post as I am having the same shudder issues. Mine is an 09 with 3.6l and 8k miles. The vibration is noticeably worse when the Defrost is on, but does exist with it off as well. The Main times I notice it is when coming into a parking spot or slowing while turning the steering wheel. It is almost bad enough to rattle the dash. Took it to the dealer and they tell me its normal. Well I cant imagine this being just normal. Also I noticed a shudder while driving around 60 and downshifting to around 3k rpms and giving it slight acceleration. It almost feels like a wheel out of balance but goes away when it upshifts into a higher gear.
Dealers say it is normal, since they are clueless how to fix it.
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