"Kingfish" wrote in message
oups.com...

There were a few good suggestions from others already - Turbo bearing
coking does make sense, but you clearly know to let the turbo unspool
before shutdown so that might not be as likely. (IIRC there is a way to
clean up the turbo bearings without turbo removal if that's what it
turns out to be) My guess would be the fuel control unit gone wonky;
the fact that power returns after richening the mixture might back up
that theory, but what are the chances of both acting up simultaneously?
Maybe the alternate air diverter is partially open? Out of curiousity,
what CHTs are you seeing at 1425 EGT?


I know the fuel controls were double checked and adjusted when the problem
first came up. That doesn't mean they aren't the culprit, but they seem to
act normally when tested.

CHTs never get out of the green arc and typically remain at about 75% of the
scale.

BDS