Still have low freq vibration (95 A6Q)

[Ed Kellock]

What about swapping all four tires around the car variously, front to back,
side to side, etc.?



-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of beattyr2003 at cox.net
Sent: Tuesday, September 22, 2009 5:05 AM
To: quattro at audifans.com
Subject: Still have low freq vibration (95 A6Q)


I posted about this oh 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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