Re: Strange antilock-off behaviour (or self-engaging diff lock?)

["Louis A. Mulieri" <lmulieri@zoo.uvm.edu>]

Something similiar happpened to me last winter.  First noticed that some 
gremlin, without my permission was disengaging my anti-lock system.  Not 
bothersome but then it began to engage the center diff lock.  Horrors. My 
excellent mechanic, Larry Reed, diagnosed and fixed in 15 minutes--no 
parts needed.  This is the deal when you turn the switch to lock diff it 
sends signal to switch X.  Switch X disengages anti-lock system and turns 
on indicator light for diff lock (to tell you that you have turned it 
on).Switch X was being activated by a bent heat shield.  Bend shield 
back; voila troubles end.  Hope this helps.> > 
>For the last week, every time I start the car, within a few blocks
> the "antilock off" light will light up. Cycling the engine power or
> the rear diff lock will make it go out and stay out for the rest of
> my trip, be it 5 minutes or 2 hours.
> 
> Horrors!  Brings me back to memories of those insane moments when the
> same would happen to my old '90 90q20V.  The diff lock could be
> "engaging" itself as mine did when I used to race up from sea level to
> 8000ft.  Would have to stop, manually engage diff (reset?) and manually
> disengage (while all the trucks/cars I passed would then pass me by). 
> When the differential is locked, the anti-lock brakes are also turned
> off.
> 
> Turns out the *&%$#! diff lock would be engaged even at speeds well,
> well over the 15mph limit - dry pavement and all.  The Horror! The
> Horror!
> 
> Could never find out what was wrong. Toyed with idea of permanently
> disabling diff lock - but deterred by visions of the quattro stuck with
> one wheel spinning in some ridiculously-simple situation, like a gas
> station entrance or something (some 4 wheel drive ya got there buddy!)
> 
> Be careful, 
> 
> Siegfried
> 94 90csq (with well behaved diff lock)
> 
>