[V6-12v] Odd vibration 95 A6Q

[Jonathan]

Hi,

This may sound stupid, but have you hade your wheels balanced and alligned? 
and if so, was the person who did it competent and paid attention when doing 
so? I have a similar issue due to their being a slight buckle in the wheel. As 
I only have a front wheel drive, and this is onthe back, there is negligiable 
tyre wear anyway, so I'vegot better things to spend money on. Counter to 
traditional response though, the suspension on my car atleast works to the 
point where it seems to change it's hardness when ever it resonates, giving a 
similar result to what you described at a specific speed.
I'm a mechanical engineer, and work with mechanical engineers, non of us have 
been able to work out how that makes sense on a 96 A4, but that is what 
happens!

cheers

Jon

>
> Message: 1
> Date: Tue, 22 Sep 2009 7:07:07 -0400
> From: <beattyr2003 at cox.net>
> Subject: [V6-12v] Odd vibration 95 A6Q
> To: v6-12v at audifans.com
> Message-ID: <20090922070707.E289S.40850.imail at eastrmwml33>
> Content-Type: text/plain; charset=utf-8
>
> I posted about this on the main list about a week ago and only saw a couple
> responses, neither of which could be the problem.
>
> I have noticed some more things about the symptoms.
>
> Its most noticeable at speeds around 20-40mph.  Its irrelevant to having
> the car in gear or in neutral, clutch in or out.  I had said before it went
> away when I turn, thats wrong, it doesnt go away turning it stays the same.
>
> The best way I can think to describe it is if you were driving on a very
> finely cut rumble strip in the road.  Or grooved pavement.  It also
> feels/sounds? like its coming from the rear of the car.
>
> Since its not dependant on the engine being engaged, I can rule out
> anything motor related.
>
> I know what wheel bearings going out usually sound like, they howl at
> nearly all speeds instead of vanishing at 50+ mph.  So that rules out
> bearings.
>
> I am left with thinking its either something in the rear drivetrain, or my
> tires somehow have worn in an odd fashion to cause this odd noise.
>
> Anyone got any ideas on this?
>
> Things I have done with the car recently are replacing the prop shaft rear
> CV joint over the summer and I just replaced both rear tie rods.  I have
> verified that the center bearing support has not come loose nor does it
> look like its in terrible shape.  I could crawl back under the car and
> verify that my CV joint bolts havn't started loosening up, but other than
> that or swapping all 4 tires out, I am kind of at a loss for where to go
> next.
>
> Thanks,
>
> Rob
> 1995 A6Q (271k miles)
>
>
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> End of V6-12v Digest, Vol 67, Issue 1
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