1988 80 Quatt. w/ MT and AC---Differential Lock Up

[Larry C Leung]

If you have a Torsen center diff (I think you do, you don't have control
over the center diff, do you?) then the rear diff is SUPPOSED to unlock
at 15 MPH or there-abouts.

LL - NY

On Fri, 16 Nov 2001 12:41:08 -0600 "Dr. Cory Brayton"
<cbrayton at bcm.tmc.edu> writes:
>I've had a similar problem but differential would unlock @>15mph
>
>I also suspected I had vacuum problems dt HC>200 on emissions test +
>sporadic engine light flashes --> I had significant vacuum leaks from
>old
>hoses + intake boot
>
>since repair I think brakes are better, I've not had the differential
>lock
>problem & no engine light flashes
>
>I'll be interested to know how your vacuum system is doing & if it is
>involved in your differential problem
>
>I may have a switch problem too & it may just be coincidence that I've
>not
>had the problem since the repair
>
>Cory Brayton, D.V.M.
>88 80Q
>Houston, TX
>
>> To:
>> Subject: 1988 80 Quatt. w/ MT and AC---Differential Lock Up
>>
>>
>> This is a multi-part message in MIME format.
>> --
>> [ Picked text/plain from multipart/alternative ]
>> Do you happen to know what might be the problem with my car (88 Audi
>80
>> Quatt w/MT and air)? I went to engage the rear differential. The ABS
>OFF
>> light (on dash.) came on and the rear wheels locked in--as expected.
>The
>> problem is that now the ABS OFF light will not shut off and the
>diagram
>> indicator (near the emergency brake) will not turn off. The lit
>> arrow on the
>> actual DIFF button will turn on and off when I go faster than 15
>> mph or when
>> the DIFF button is depressed. The car itself seems like it has
>> remained with
>> rear differential locked. For instance, the car is difficult to
>> turn at slow
>> speeds. In addition,  there are two knocks from the front end
>> after the car
>> comes out of the turn. I have driven the car faster than the 15-20
>mph and
>> the rear will not disengage. Anything you might know and could
>> pass on would
>> be of great help. By the way, repeatedly pushing either the ABS
>button in
>> center console or the DIFF button near emergency brake seems to do
>nothing
>> other than light and unlight the arrow on the DIFF button.
>> Thanks
>> Blu
>