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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Mon Apr 27, 2009 6:36 am Post subject: Buzzing behind! (at higher rpms) |
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Hey guys,
I do recall a few discussions about the rear ends being noisy, but I have much luck finding them.
Anyway, like the thread says, My car makes a buzzy vibrating noise in higher rpms. I recently inspected the transaxle area, and found a loose fuel pump. I tightened it, but I am still getting alot of noise/ vibration at about late 4k-5k rpms. I checked the torque on the cv bolts, they all seemed fine. I also have re greased the cv's pretty recently.
Any suggestions of what I should check? I must add that I do not currently have the sound deadening carpeting in, but the noise is so loud I'm sure that it wouldn't make much of a diffference.
Thanks,
Ryan
edit- Should also add that this buzzing is not the type of buzz that a running fuel pump makes. _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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Smoothie
Joined: 01 Jan 2003 Posts: 8032 Location: DE (the one near MD, PA, NJ)
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Posted: Mon Apr 27, 2009 9:48 am Post subject: Re: Buzzing behind! (at higher rpms) |
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StienbargerR wrote: | I must add that I do not currently have the sound deadening carpeting in, but the noise is so loud I'm sure that it wouldn't make much of a diffference. |
We might have to agree to disagree on that.
I've noticed that the sound deadening makes a huge difference.
I was noticing my normally noisey transmission just the other day. Can hear it clear as day, and I have the factory sound deadening, and the carpeting, plus a thick padded removable carpet piece on top of that. That probably adds up to 1.25" of sound insulation.
Drove it a bit a couple years ago with nothing back there after finishing my repaint and it was crazy noisey. _________________ "..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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RC
Joined: 25 Mar 2007 Posts: 2636 Location: Australia
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Posted: Mon Apr 27, 2009 1:00 pm Post subject: |
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Wouldn`t be the exhaust vibrating/ resonating?
Have had problems with mufflers and resonator not supported sufficiently, flexing, and breaking internally or around end flange.
Agree that it is noisier without the sound deadening but not dramatically and nothing that a few extra watts through your woofers can`t overcome. |
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joecitizennn
Joined: 12 Sep 2005 Posts: 2096 Location: no mans land
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Posted: Mon Apr 27, 2009 1:10 pm Post subject: |
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Tranny noise is common in our cars. I have noticed diffirent levels of noise between cars with equally good transaxles. Gear lash, mount condition, wear and especially sound matting have effect on this aspect of the 924. I am so used to it I seldom pay it any mind. I have been through several junk porsches and hand picked a quiet tranny that has great synchros . Its sometimes luck of the draw. |
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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Mon Apr 27, 2009 5:43 pm Post subject: |
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Hey thanks for the input. I guess I will put the carpet back in for starters. I will definitely check the muffler/ exhaust system. Some of you may know I had an accident in it last year and haven't driven it much since, so maybe a hanger got loose or damaged.
Ryan _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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Nobbi
Joined: 24 Aug 2006 Posts: 1379 Location: Germany
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Posted: Mon Apr 27, 2009 8:32 pm Post subject: |
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Do you have the right amount of oil inside of youre tranny ?
Did you put back on the half-round metall brackets on your drive shafts?
You took them off to re-grease .... In the right place?
Did you lost some balance-weight on your tires ?
Do you run the right tire-pressure?
to be contiued....... _________________ NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1969 |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Mon Apr 27, 2009 9:33 pm Post subject: |
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Nobbi brings up an excellent point about the tires being a possible culprit. On my daily driver BMW 325i, I had a really loud howling sound that I was almost certain were wheel bearings...sounded just like 'em, and the car was at 160K+ miles so it would have been plausible. However, it turned out to be the tires, believe it or not. A quick and simple rotation fixed the problem.
Take a look at the tread of your rear tires. If you took a hit, it's possible the car is out of alignment and the tires are wearing unevenly. _________________ erstwhile owner of just about every 924 variant ever made |
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924guy
Joined: 29 Dec 2003 Posts: 2088 Location: Port St. Lucie, FL
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Posted: Mon Apr 27, 2009 10:09 pm Post subject: |
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also check the heat guards between the body and tubes... sometimes they can rust loose a bit and make a wicked noise that sounds somewhere between a screaming cat and a bumble bee... it resonates through the whole car and makes it sound like its coming from the rear sometimes, when its actually right under the shifter area... _________________ Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha |
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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Tue Apr 28, 2009 4:15 am Post subject: |
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924guy, Im not quite sure what exactly you are talking about, but the description of the sound fits the bill. could you expand a little bit about where the screws are?
thanks,
Ryan _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Tue Apr 28, 2009 7:39 am Post subject: |
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I believe he is referring to the heat shield that is directly above the torque tube, in the tunnel, and directly between the driver and passenger seat. It is not fastened with traditional nuts or bolts. There are tiny studs welded to the body, and the panel fastens with these funky flat-style speed nuts. If the speed nuts are corroded and have gone missing, the heat shield will come loose over time, and could be vibrating against the torque tube. _________________ erstwhile owner of just about every 924 variant ever made |
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924guy
Joined: 29 Dec 2003 Posts: 2088 Location: Port St. Lucie, FL
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Posted: Tue Apr 28, 2009 12:02 pm Post subject: |
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ideola wrote: | I believe he is referring to the heat shield that is directly above the torque tube, in the tunnel, and directly between the driver and passenger seat. It is not fastened with traditional nuts or bolts. There are tiny studs welded to the body, and the panel fastens with these funky flat-style speed nuts. If the speed nuts are corroded and have gone missing, the heat shield will come loose over time, and could be vibrating against the torque tube. |
what he said... ^^^^ _________________ Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha |
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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Wed Apr 29, 2009 5:38 am Post subject: |
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oh, gotcha. I will check that out too
Thanks,
Ryan _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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Nobbi
Joined: 24 Aug 2006 Posts: 1379 Location: Germany
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Posted: Wed Apr 29, 2009 11:35 pm Post subject: |
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....one more point: Does it make that noise also when parked ?
and does it make a diffrence if you press the clutch pedal ? _________________ NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1969 |
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StienbargerR
Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN
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Posted: Fri May 01, 2009 12:47 pm Post subject: |
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Nobbi,
It never makes noise parked, and no noise till past about 3,000 rpm. I put the carpet back in and it helped alot. I also noticed that my passenger side rear tire is wearing abnormally, so I think it is out of alignment. Also, it could probably use some fresh oil in the transaxle.
Thanks for the help all.
Ryan _________________ 1978 924 NA
-250lb lowering springs, Euro Pistons |
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