|Topic Review (Newest First)|
|05-30-2019 06:59 PM|
Same thing happened to me on my 2007 G6 GT Convertable.
It's the resonator ahead of the muffler that is whistling when you accelerate.
Have it replaced and it won't whistle anymore.
|05-24-2019 01:32 PM|
Originally Posted by ratskat View Post
|10-23-2011 08:07 AM|
G6 Whistling Muffler Service Bullentin Attached
Originally Posted by TurboDiverArt View Post
Just got my G6 back from the dealer two days ago. Whistle when accelerating is all gone. Back to a nice sounding vehicle. Now if they would just come out with a brake recall for the squeak. Has to be the calipers as I've replaced my rotors and brakes entirely and they still squeal.
Hope this service bulletin helps others get this issue fixed, that's if you’re still within your warranty period. Just made mine by 300 miles.
|10-07-2011 03:55 AM|
That's actually good news. A service bulletin I was shown that pre-dated yours told dealers not to fix the whistle as the exhaust was "performing as expected" and that it was part of the design. I only got mine fixed under warrantee because I had just bought the car as a certified used and luckily at the time of purchase I had mentioned this not knowing what the problem really was. At the time we thought it was actually a squeaky belt. Luckily my salesman wrote it down and was more than happy to show it to the service manager saying, "we said we would fix it as a condition of the sale". My sales bulletin said to discontinue the practice of replacing the entire exhaust, which apparently was the previous solution to this problem. I'm glad if they have figured out another way to fix it and have it covered under warrantee. If you can, get a copy of the service bulletin and post the bulletin number so in case anyone else has the same problem they can refer to it.
|10-06-2011 12:48 PM|
There is a 'Service Bulletin' for the resonator in the muffler
Just took my 08' G6 with 35K into the dealership today for this exact issue.
I didn't catch the number, but they showed me a July 2010 Service Bulletin for the title said 'Muffler Whistle'
Might or might not get a copy of the report next week when the part arrives.
But the dealer is replacing this item for free.
|03-26-2011 06:43 PM|
Originally Posted by lhblossoms View Post
|03-26-2011 02:37 PM|
|pnbgross||Just as an FYI, after having this happen on my '07 convertible this winter after 22,000 miles I took it to my regular mechanic (not dealer) who put it up on the lift and verified that the whistle was in the resonator. At his recommendation, I took it to a muffler shop and for about $100 I had the useless resonator replaced with a straight pipe. Works beautifully and unlike an exhaust replacement, in which you expensively replace a badly designed part with a new badly designed part, it can never happen again.|
|11-12-2010 07:34 AM|
|lhblossoms||Hi All - my original post was back in July 2009. I never came back to say that after keeping my car for a week (due to much much much complaining from me) after GM refused to replace my exhause while under warranty, they finally did replace the full exhaust system. After 24,000 miles on the new exhaust - it failed (my original failed right at 24K as well) and the lovely first gear whistle is back and growing louder all the time. Needless to say - if it is going to be fixed now it will be by me and with an after-market exhaust. Then let go of the car - sigh - between that and the crazy creaking that goes on in the front end and the rumbling front breaks, thinking it is time for a change. Good luck all.|
|11-10-2010 05:26 PM|
Originally Posted by GPG6Vert View Post
|02-05-2010 11:09 AM|
|SexyG6||i had the same issues w/ my stock exhaust tha was intermittent, would sometimes wistle but ony when it was cold out. this last fall i put on the GTR exhaust and i love it, if it whistles you cant hear it over the sound of the exhaust LOL|
|02-05-2010 07:59 AM|
|waterfowler76||expensive but a good excuse to get a new ehaust|
|02-05-2010 06:37 AM|
I realize it's an old topic but luckily it came up in a search.
I am now experiencing this wonderful hissing/whistle noise. It only happens going from stop > start up to 1500rpm. As soon as I go over 1500 it stops and it is very faint. Some days a little louder than others but it's never constant.
I have been researching and I heard it could be the tensioner pulley or even PCV valve. I've had a listen and it doesn't sound like the PCV valve or pulley. It sounds more like it's coming from under the engine...
I just got back from the dealer with a very unhappy impression. Here in Canada it is extremely difficult to find a GM dealer that actually makes an attempt to fix your problem. Most of the time if you let them, you will walk out with everything else fixed but the problem and a empty wallet.
Anyway, can anyone suggest what to do? Ask them to replace the exhaust from the flex pipe? This sounds like a huge expensive job. If it's nothing too serious, I might just wait until it gets worse.
Thanks in advance.
|11-08-2009 05:21 PM|
|jc88_usmc||HAHA! That's funny. nice one.|
|11-08-2009 05:16 PM|
Originally Posted by slls View Post
|11-08-2009 04:58 PM|
|jc88_usmc||The gasket at the flange on my flex pipe went out a couple months ago. I didn't even bother with the dealer. I just used some liquid gasket maker and redid it myself. Haven't had any problems since.|
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