Hot Start? NOT

[washburn]

Hi fellow Audiettes.  I've been off list for a bit, but need to tap into
one of the best sources on the 'net.  I know the experts must have
tackled this one before, and I'm hoping I can get a quick diagnosis:

1988 5000 CS Turbo Quattro Wagon

Symptom:
Since weather reached minus zero temps, the car will not start with a
warm engine.  Starts right up *immediately* after shutting down, but
anything longer than 3 to 5 minutes and the problem surfaces.  Cold
starts are excellent.  Problem seems to last between 1 to 2 hours, where
it will then behave as normal.  Note:  I have occasionally been able to
get it sputtering to life by pumping the bejeesus out of the throttle
while overworking the starter motor.

Question:
What's the deal with that?

Thanks list!!!!

Pat Washburn
Wausau (cold as hell) WI