Pontiac G6 Forum - Reply to Topic
Thread: Hissing / Whistling noise when foot on gas Reply to Thread
Title:
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now



In order to be able to post messages on the Pontiac G6 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
05-30-2019 06:59 PM
susiedog 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
dmoore551
Quote:
Originally Posted by ratskat View Post
Not sure if any of you have dealt with this problem before but my car had been making a hissing/whistling noise for over a year and it had been getting progressively worse. This noise only happened when pressing on the gas and while driving. You could not duplicate the noise if you were in park and pressing on the gas.

I had brought it to the dealership near my home and they heard it but were unable to identify what was causing it. They told me they would ask GM if they had heard of the problem as they could find no bulletins for this problem. I didn't hear back from them and this was quite a few months ago.

Finally unable to stand it any longer and wanting to make sure it would be still covered under warranty I brought my car into the dealership closer to my work where I bought my 6er - this was just a week ago. Not even 30 minutes after I left the car at the dealership I got a call from them telling me I could pick up my car that they believed it had to do with my exhaust and they were ordering it from GM and it would probably take a week to come in. So now within the week they said the exhaust was in and I dropped off my car this morning. By 10:30 they called me to say it was all fixed.

It sounds great...no more whistling and the invoice states " replaced exhaust from flex pipe back ".

The only downside is that they gave me the chrome performance tips - removing my Magnaflow 4" double walled angle cut stainless steel tips because they said they had to put back on the car what was on it when I bought it - but at my request they made sure to give me back my magnaflow tips.

Now I just have to decide if I will have them welded back on or leave it be.

So I hope this helps anyone else that goes through this in case you get a dealership like the first one I dealt with.
I am having the same thing happen to me there is a whistling sounds at 1500 RPM and then the fast you go it stops and i had someone standing at the front of the car and the back and it most definitely the exhaust system.
10-23-2011 08:07 AM
gnvdude
G6 Whistling Muffler Service Bullentin Attached

Quote:
Originally Posted by TurboDiverArt View Post
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.

Art.
Art, as you asked here's the service bulletin (attached as a PDF). They were kind enough to make a photo copy for me.

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
TurboDiverArt 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.

Art.
10-06-2011 12:48 PM
gnvdude
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
Reg Beckett
Quote:
Originally Posted by lhblossoms View Post
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.
I had the same experience replaced once under warranty at 40000 km and it started whistling again at 90000 km decided to go after market GTR sounds gread and guess what NO WHISTLE.That resonator is a pos
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
TurboDiverArt
Quote:
Originally Posted by GPG6Vert View Post
Great info! Cars at the Dealer now and they knew about the exhaust and replaced. They found some other minor issues they were to finish up today. So I was wondering about the replacement system they installed from their stock. This is a ONE piece system and what makes this one any different than the one they replaced? You’re correct in assuming the black tailpipe is attributed. The Service guy explained this is causing an exhaust restriction. That may be affecting fuel ratio? So I’ll have a discussion with them today and try finding initial cause within the exhaust system and their intentions if/when their replacement one fails and post. Good luck on yours and plz post your results.
I couldn't agree with you more. My dealer said it's the weep hole in the exhaust and is not covered by GM. I expect to fight with them about this cause I just bought the car and I mentioned the “squeal” before I bought it and they said they would fix it. If it's the weep hole I wonder if enlarging it slightly might stop the whistle or change the pitch. If too big you can probably seal it with JB Weld and re-drill the hole to the stock size. I'd hesitate to seal the hole only because the muffler would fill with water and rot out. But then again, most other mufflers don't have drain holes and last for a long time so how bad could it be?

Art.
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
datacat 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.


Shaun
11-08-2009 05:21 PM
jc88_usmc HAHA! That's funny. nice one.
11-08-2009 05:16 PM
geewhiz
Quote:
Originally Posted by slls View Post
[IMG][/IMG]

This is what was in my Malibu resonator, no wonder they plug up.
Has anyone seen my grandma?



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.
This thread has more than 15 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome