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Discussion Starter · #1 ·
I have a '07 G6 GT that I inherited from my 87 y/o grandfather when he past away in January. Yes, it's red because what other color would an 87 year old man drive. Within the last 2 months I've started noticing a high pitch whistle/noise when I accelerate. If I back off the throttle its goes away. I thought it was brakes at first but I get no noise when I brake at any speed. Only when I accelerate. Anyone have any thoughts? Haven't brought it in yet, want to see if its a minor fix I can do myself.

Thanks.

Mario
 

· 07 Black GT Vert ♥
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445 Posts
I have a '07 G6 GT that I inherited from my 87 y/o grandfather when he past away in January. Yes, it's red because what other color would an 87 year old man drive. Within the last 2 months I've started noticing a high pitch whistle/noise when I accelerate. If I back off the throttle its goes away. I thought it was brakes at first but I get no noise when I brake at any speed. Only when I accelerate. Anyone have any thoughts? Haven't brought it in yet, want to see if its a minor fix I can do myself.

Thanks.

Mario
I've read the whistle is caused by a factory installed weep hole in the muffler that's designed to let water escape.
 

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EDIT:(during me typing this looks like you answered it LOL)

Ive had the whistle but its mostly from 1-2 when the rpm's get in the 3500-4000 range when shifting i thought it was the trans slipping or the serpentine belt.
Im leaning towards the serpentine but Ive had it forever since i picked up the car.
Also a couple people have changed the belt and the noise stopped. But i have yet to do that.
 

· 2007 G6 'vert
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21 Posts
I have the exact same issue with my '07 GT convertible. High pitched whistle at certain levels of acceleration.
The car is almost 4 years old (it was originally bought in Dec 2006) and 20K miles on the original serpentine belt. I guess I will try changing it this weekend and see if that resolves the problem. Dealer is a bit far away and would charge for the belt anyway.
If not the belt then I will look for the "weep hole".
I'll post back my results next week... I hope this is the answer.
RD
 

· Pontiac lives thru us !!!
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We've got a '07 G6 HTC as well and recently started experiencing a whistle or screeching noise when accelerating. We recently put on new rotors and pads so I first thought it was the brakes but then realize its only on acceleration.

I am taking in the G6 in on 9/22/10 to get the roof button replaced (pressing button would start retraction but stop after a few seconds which then required button to be re-pressed) - I've printed out this thread to show Dealer Service to have them check out my issue - I'll post results as well.
 

· 07 Black GT Vert ♥
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445 Posts
We've got a '07 G6 HTC as well and recently started experiencing a whistle or screeching noise when accelerating. We recently put on new rotors and pads so I first thought it was the brakes but then realize its only on acceleration.

I am taking in the G6 in on 9/22/10 to get the roof button replaced (pressing button would start retraction but stop after a few seconds which then required button to be re-pressed) - I've printed out this thread to show Dealer Service to have them check out my issue - I'll post results as well.
I've read the whistle is caused by a factory installed weep hole in the muffler that's designed to let water escape.
Wasn't the weep hole. Turns out my idle pulley is bad and that stretched out the S belt. Oh yeah, both my front struts are leaking, at 25,500 miles.......................
Take your pick!
 

· 2007 G6 'vert
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I just tried a new serpentine belt and new idler pulleys, no change at all so I guess I am going looking for a weep hole before I take it to the dealer.
I was surprised that the belt was not in stock anywhere, then I saw how long it is. I don't think I have ever seen one so long before..
Due to the dealer cancelling my after market warrantee ("oops it was a clerical error") I now have to wait 30 days for the coverage to take effect.
arrghh...
 

· 2007 G6 'vert
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21 Posts
Not too bad to change, invest a couple of minutes and remove the airbox, you will be glad you did.
And you will probably need a strong bar to move the motor mount back a hair to replace the spacer. You will see what I mean when you get there..
Rob
 

· Pontiac lives thru us !!!
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Brought the G6 HTC in for service on Thursday 9/23 - Tech told Service Manager that on his test drive he heard the whistling/squeal - checked belts, PVC value as A-OK - had a Tech rev the car while on the jack and heard whistle through the exhaust system. Wasn't clear whether it was at the resonator or Cat - they indicated a replacement exhaust may correct but they said this is common with G6s.

At 27,000 miles it doesn't need a replacement cat-back so we'll just turn up the music...
 

· 2007 G6 'vert
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21 Posts
This is just depressing. A design defect that turns up at 27K miles (or in my case 20K miles) and isn't even covered by the warrantee.
I wonder if the whistle is internal or from a weep hole in the resonator as mentioned before? Maybe a stainless steel screw in the weep hole will quiet or eliminate the noise.
 

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that weep hole is there for a reason to let condensation out. plugging it could cause the muffler to rust from the inside out.
 

· Moderator Member Thingy
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I think I might have to get my belts checked after reading this because I just recently had the whistling on acceleration that seems to come from the engine. It started at around 80k miles and Im at 85k now.
 

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Mine has the same problem, just bought the car. I'm furious if there is no warrantee fix for this. I may have to push the dealer to return it cause the car had the squeal when I test drove it which I mentioned to them and they said they would fix it when I brought it in for service. Love to drive the car but the squeal will drive me nuts. Got to be a way to fix it without sealing the weep hole. And to think I purchased an additional 2 years on the warrantee and at this point it’s useless.

Art.
 
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