Hissing / Whistling noise when foot on gas - Pontiac G6 Forum
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post #1 of 24 (permalink) Old 06-17-2009, 03:22 PM Thread Starter
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Hissing / Whistling noise when foot on gas

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.

2007 White Convertible G6 GT 3.9L V6 VVT engine
Painted red Calipers, chromed grills, Magnaflow 4" Round-Angle Cut - Double Wall T-304 Stainless Steel Exhaust Tips, Redline Tunning quicklift system (hydraulic engine hood lifts), Debadged side & rear except for Dart


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post #2 of 24 (permalink) Old 07-12-2009, 07:57 PM
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Great info! Mine is doing the same and I will be calling My dealer for service tomorrow. Will post results.
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post #3 of 24 (permalink) Old 07-13-2009, 07:00 AM
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Anyone know of a Service Bulletin, TSB info regarding this issue I can reference before proceeding with Dealer Service?
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post #4 of 24 (permalink) Old 07-13-2009, 05:08 PM
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Keep an eye out on this problem. I had my first exhaust assembly replaced in Oct. 08 at 23K miles. It's now less than 8K miles and 9 months later and the whistle is back. Luckily it is before my 36K for warranty ends. This is a defect in the car and I'm gathering a lot of various email posts to take to the dealer tomorrow because I want this defect warrantied longer.

Perhaps you know this. My tailpipe is very black, I believe it is because the fuel is burning rich and they say that it is supposed to look this way (I've looked at a lot of tail pipes - no, I don't think it should). Considering that is also exhaust based I wonder if there is any connection. Regardless, beware on the longevity of the repair.
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post #5 of 24 (permalink) Old 07-14-2009, 07:00 AM
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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.
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post #6 of 24 (permalink) Old 07-14-2009, 08:12 AM
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[IMG][/IMG]

This is what was in my Malibu resonator, no wonder they plug up.
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post #7 of 24 (permalink) Old 07-15-2009, 06:08 AM
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Got the car back yesterday. They replaced system stating cause was "Resonator".
Service said they have replaced several due to this issue and have not had a return.
So...??? This system should last me till I MOD. This stock unit is "Smothering" this 3.9!
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post #8 of 24 (permalink) Old 07-15-2009, 05:16 PM
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Well, as I said, keep an eye out for this issue. My dealer today REFUSED to replace my exaust system again even though I am still under warranty. According to them, GM will not allow them to replace the part "because there is nothing wrong with it." They said that as my exhuast system "settles in" that this is a natural progression of it and that "there is no fix." Okey Dokey...since when does a car company design a car to intentionally develop an obnoxious whistle that does go away when the new part is installed. hmmmm

Now some day, I was told, if GM ever decides that this really is a problem, I'm on the list for a replacement. Sadly, with Pontiac as now the sacrificed group, I'm thinking that GM isn't going to put much effort into Pontiac issues.

I was given the number of GM's customer service to file a complaint and now am awaiting a verdict.

As for the black soot, I was again told that this is a non-issue and that my fuel is running just fine and dandy.
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post #9 of 24 (permalink) Old 11-08-2009, 03:43 PM
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Same problem here...

I have the same problem... I'm currently at 78 000KM and my warranty ends at 80 000KM... i got to gm 2 days ago and they told me it was "normal" noise... I hate this noise and i think its getting worse with time... I don't know what to do or to told them... The first guy wasn't hearing it, the second told me its normal...
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post #10 of 24 (permalink) Old 11-08-2009, 04:58 PM
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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.

Oorah!

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Looks: Painted engine cover, Streetglow Xenon Strobe kit in headlights(red), blacked out tail lights, custom "G6OWNERSCLUB.COM" Logo in third brake light.

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post #11 of 24 (permalink) Old 11-08-2009, 05:16 PM
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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?




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post #12 of 24 (permalink) Old 11-08-2009, 05:21 PM
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HAHA! That's funny. nice one.

Oorah!

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Looks: Painted engine cover, Streetglow Xenon Strobe kit in headlights(red), blacked out tail lights, custom "G6OWNERSCLUB.COM" Logo in third brake light.

Handling: Sumitomo HTR ZII 235/45/ZR17 tires, ATE Performance Slotted Brake Rotors (front only), HAWK HPS High Performance Brake Pads (all around)
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post #13 of 24 (permalink) Old 02-05-2010, 06:37 AM
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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
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post #14 of 24 (permalink) Old 02-05-2010, 07:59 AM
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expensive but a good excuse to get a new ehaust

2007 PONTIAC G6 GT

Waterfowler's 6 <---- Check out my 6
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post #15 of 24 (permalink) Old 02-05-2010, 11:09 AM
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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

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