Low boost/lack of power MC2-engine (MC dual knock)

[jlagnese at massed.net]

One thought came to me just after the delete key had
struck again. Once the engine heats up parts expand
and sometimes a leak can become more noticeable.(or
less)
---- Original message ----

  Date: Mon, 16 Mar 2009 16:15:30 -0400
  From: George Selby <gselby4x4 at earthlink.net>
  Subject: Re: Low boost/lack of power MC2-engine
  (MC dual knock)
  To: quattro at audifans.com
  >At 03:00 PM 3/16/2009, you wrote:
  >>I agree that the problem sounds related to a
  turboleak.
  >>But lets say it is a turboleak. How can a
  turboleak only occur
  >>after 30-60 minutes of driving? And if I turn
  the engine off and let
  >>it sit for a while, boost is again up to what it
  should be, 1.4 bar.
  >>I mean.. a periodic turboleak? Even plausible?
  >
  >Yes it's possible. Some bits are attached to the
  car, and some to
  >the engine (The fuel distributor and intercooler
  are attached to the
  >car, while the turbo and throttle body are
  attached to the
  >engine.) The engine moves around while you are
  driving, which can
  >open and close off tears in the tubing between
  the aforementioned
  >items) and cause seemingly random leaks in the
  tubing. Generally,
  >problems start out occurring on a slight basis,
  then start happening
  >more and more often, until finally the car won't
  start because they
  >are so bad. I had this happen on both my 89 80
  and my 90 200.
  >
  >One other thing I'll mention as a possibility, I
  was having a problem
  >with random power loss on my 200 Turbo, and on a
  lark changed the
  >fuel pump relay. Problem solved, until the intake
  rubber elbow
  >coming off the turbo tore, and presented similar
  symptoms. Fixed
  >that a about a month ago, and now I'm back to
  full power all the time.
  >
  >George Selby
  >
  >_______________________________________________
  >quattro mailing list
  >quattro at audifans.com
  >http://www.audifans.com/mailman/listinfo/quattro
  >---
  >Watch this space for ads :)