Driveline problems 90q

[David.Payne at brinksinc.com]

Mark,
Thank you for your input.  All the things that you mentioned are possible
with the exception of the subframe issues, I don't believe I have any
issues there.  I'll know more after tonite and I'll let you know.
Thanks, Dave.





|---------+---------------------------->
|         |           "Mark J. Besso"  |
|         |           <quattro at audispor|
|         |           t.com>           |
|         |                            |
|         |           01/03/05 11:33 AM|
|         |           Please respond to|
|         |           "Mark J. Besso"  |
|         |                            |
|---------+---------------------------->
  >--------------------------------------------------------------------------------------------------------------|
  |                                                                                                              |
  |       To:       <David.Payne at brinksinc.com>                                                                  |
  |       cc:                                                                                                    |
  |       Subject:  Re: Driveline problems 90q                                                                   |
  >--------------------------------------------------------------------------------------------------------------|




Dave,

I'm going to make a couple of guesses regarding your car.  My first guess
is
that you have a number of rubber mounts that have failed, or are about to
fail.  I'd look at the right-front motor mount first.  It's my guess that
it's sagged or failed allowing something to contact the driveshaft under
negative load. (Deceleration)  Look for witness marks on the catalyst, any
heat shields, etc.  My next guess is the rear differential mounts that were
going bad - have GONE bad.  They're allowing the differential to lift away
from the rear subframe under negative load which raises the driveshaft;
thus
allowing contact with any of the aforementioned items.  My third guess is
that it's possible you've either broken a couple of subframe bolts, or the
bushings for them have disintegrated to a point where the entire subframe
can moved around their remains.  If that is the case then you MUST NOT
DRIVE
THE CAR until you get it fixed.

Please be careful if you have to drive this vehicle.  Also, take extra care
when working underneath it too.

Let the list know what you find - best of luck,
Mark


----- Original Message -----
From: <David.Payne at brinksinc.com>
To: <quattro at audifans.com>
Sent: Monday, January 03, 2005 6:31 AM
Subject: Driveline problems 90q


> OK guys, this is starting to get serious.  I've had some drivetrain lash
> problems with this car ('89 90q) since I've owned in (just over a year,
> about 12k miles).  Now I'm picking up some scary noises as well.  When
the
> drivetrain has reverse torque, i.e. when in reverse or under engine
> braking, I get a substantial 'ring' that seems to happen once every
> driveshaft rotation.  The best that I can tell, the noise is coming from
> the tail housing of the gearbox, right where the torsen lives.  I plan on
> getting under the car tonight and putting a load on it in reverse and see
> if I can pinpoint it a little closer.  In addition I have a new knock
that
> comes from the rear end at low speed, under 15 mph, again while under
> engine braking like when coming to a stop.  I haven't been able to
> duplicate the knock by driving in reverse, and the knock only seems to
> show
> up after driving for 15 mins or so.  The knock sounds like the diff is
> trying to divorce itself from the rear subframe, you can hear it and feel
> it.  This car needs new front diff mounts and g-box mounts, but it has
> needed them for a year, it didn't just happen.  Both the g-box and diff
> fluid was changed when I got the car and I check both this weekend and
> they
> looked OK.  If anyone has any input please let me know, I'd need to get
at
> least one more year out of this beast and I have invested to much in
> getting the CIS and suspension sorted out to abandon it.
> Dave.




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