Re: [Fwd: Euro-PTrain: 93 Audi Audi 90, Differential]

[ti@amb.org (Ti Kan)]

John Larson writes:
> 1993 Audi Audi 90 2.8 L
> ...
> Hi Group, When rear wheel drive is selected the vaccuum
> actuator is activated, the ABS off light comes on and the
> rear diff indicator light comes on, around 40-50kph first
> the selector button light goes out, than a few seconds
> later the diff indicator goes out and the drive is
> disengaged. Any suggestions would be appreciated. Please
> also forward responses to automegalr@aol.com

The button doesn't "select rear wheel drive".  The car is full-time
all-wheel drive.  The button locks the rear differential to allow
the car to get unstuck in really slippery stuff.  It is only
intended for use to get unstuck from a stopped condition, not during
normal driving.  Locking the differential disables ABS, hence the
ABS-off light comes on too.  The car automatically unlocks the rear
differential when the speed is increased.

Your description sounds like the car is working just fine.

-Ti
98 A4 2.8 quattro
84 5000S 2.1 turbo
80 4000 2.0
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