5000TQ deceleration and stalling

[barry at moonbeast.com]

I'm having the EXACT same issue with my '87 5kcstq.  I've been combing the 
archives for an answer to the problem, and I may have hit upon it.

I replaced the cap and rotor, which probably wasn't a bad idea anyway, but 
ended up not solving the problem.  It helped a little.  When my car is fully 
warmed up, the problem is much less pronounced, but I still have to keep my eye 
on the tach.  I swapped in a spare ISV and that had no effect.  My car has 
brand new plug wires too, which seemed to help the idle issue when seated 
properly, but again ultimately didn't solve that problem.

This morning I unscrewed the plastic housing for the throttle switch (on the 
front passenger side of the intake manifold, just behind the 'michelin man' IC 
hose).  I used a dremel to cut open the black plastic case and resoldered all 
the microswitch connections in there (there are four).  These solder joints 
apparently fatigue over time, and that intermittent contact condition can 
really screw up the idle behaviour of your car.  I'll see if that solved my 
problem when I get home from work, and I can try it out more thoroughly-- but I 
fired the car up once with the newly flowed solder joints and it started right 
away and idled properly, something it had not been doing until it was fully 
warmed up.  (I resealed the case with JB weld, just left the car where it was 
while that cures).

Might be something to check, FWIW-
Good luck!
=BB=





Quoting "Stricker, Michael" <Michael.Stricker at gd-ais.com>:

> Hi,
> 
> My 1988 5ktq has an intermittent problem where it sometimes stalls upon
> deceleration.  If I "blip" the throttle a couple of times as I see the RPM's
> heading toward 0, I can avoid this problem.  So far, I've disconnected the
> deceleration valve to no avail.  It seems to do this only after the vehicle
> has warmed up so I suspect it is temperature related.
> 
> Does anybody have any ideas of what to try next?
> 
> Thanks in advance.
> 
> Mike
> _______________________________________________
> quattro mailing list
> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> 




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