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'91 200Q Problem - Wastegate Valve

In message <01BCC2AB.EE7A2630@ABREITMAN> "Alan Breitman" writes:

> My '91 200q will occasionally stall when decellerating or downshifting.
> I know that the turbo wastegate valve has on a number of different posts
> been the culprit.  My question is was is the best way to articulate this
> to my mechanic (independent Audi master tech) who wants to "check out
> everything."

I'm with your mechanic - it could be almost anything, and the wastegate 
frequency valve would be a fair way down my list.  It's a pretty easy device to 
check with the on-board diagnostics - I would expect that to have been done 
already, and if not it takes a couple of minutes.  I'd start with the idle 
switch and ISV, and then run through the controller inputs.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club