Low Power: 86 Audi 5000 turbo

[Preston Brown <pbrown@econ.yale.edu>]

My girlfriend just got an 86 Audi 5000 Turbo (automatic).  I have really no 
experience with these cars, but I have some (reasonable) amount of car 
knowledge.  While driving, it is hard to push this car above about 70 mph 
-- the engine light indicating that boost pressure is too high comes on, 
and I just can't seem to get the tach over about 3000 rpm.  Needless to 
say, I don't think that this car is developing the amount of power that 
it should.  Fuel economy is good -- about 27 mpg.  A mechanic I trust 
said that the turbo was not shot, which was my first idea, but he *could* 
be wrong.  Does anyone have some suggestions on where I should start 
looking for the problem, or IS there a problem?  

---
 -Preston Brown
  preston.brown@yale.edu