Paul,

   I removed the turbo 13b from the Glass Goose and replaced it with a 2005
   Renesis.  I was running the engine during fuel mixture adjustments
   when it
   suddenly started to run rough.  The manifold pressure jumped to
   about 20" at
   idle, naturally the mixture became too rich because the engine
   controller
   was reading the 20" manifold pressure.  Just before that, the manifold
   pressure at idle was between 11" and 12".

   I cannot find the source of this problem.  I removed the intake
   manifold to
   check for leaks, the gasket was ok, I replaced it, reinstalled the
   manifold,
   same problem.  The lowest manifold pressure I can get at idle is
   between 18"
   and 20".  There is a leak somewhere but where?  Or is there another
   reason
   that I am not aware of?

   Rino Lacombe
   Now, Renesis powered Glass Goose

   I did fly about 10 hours last spring (in June) with the turbo 13b.


   I have no idea. Can you take a picture of the manifold you are using?
   Is the turbo still OK?

   Perhaps you have a leak in the hose going to the manifold pressure
   gage. Get one of these hand pumps from the auto parts store and check
   it out. It is a real handy thing to have around.

   Paul Lamar ...No rotor no motor.


Is the engine still running okay at that high manifold pressure?  If
not, have you checked compression?


Regards,

Matt-

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