Engine shudder in 08 LTZ w/ 3.6

8292 Views 18 Replies 10 Participants Last post by DrivenDaily, Apr 14, 2011

bnzlva

Discussion Starter · Mar 5, 2011

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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Hellgate

· #17 · Mar 23, 2011

mk1shitrocket said:
The First time I took it in they made me take a ride with one of the service techs. I showed him all the different times it would clunk form applying the accelerator and when it would vibrate the worst. He then goes to tell me that the vibrations aren't bad and its most likely normal. Couple days later I took it back and almost annoyed they said they would look at it. Almost got into a fight with the tech about updating the firmware. All they told me was that they checked the motor mounts and updated the firmware for the transmission. They got this all done in an amazing 15 min. Oh and that the car wasn't throwing any codes so there cant be anything wrong.

Thats about as detailed as it got with the dealer. I am a mechanic and have been for years. But for some reason I cant imagine a car that is nearly new having so many "Normal" problems (quirks)

I've got the same problem as my I4. I've been to the dealer two or three times for this problem over the last few months and no one can identify the problem, like your's it doesn't throw any codes either.

I noticed today that it shudders more with the temp is over 80. Today we hit 91 and it shuttered at idle most of the way home.

The car also shuttered/missed at an even 75 to 80 mph cruise while on vacation last week. Now that my car is out of warranty I'm going to try an independent mechanic and see if they can find the issue.

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