In article ,
Bob Fry wrote:


Now, the EGT fairly consistently acts like this: it reads "normal" on
cold start, taxi, runup and takeoff. Climbout it reads around 1200
deg F. like it always did. Then, after a few minutes, it starts to
fall, and within maybe a minute or two, the needle quivers at the
bottom of the scale. It never recovers from that; but at next flight
a week or two later the same behavior happens. I never notice any
change in engine performance or sound.

Would a stuck exhaust value cause this? But wouldn't I notice
something from the engine? What else could cause this repeating
strange behavior? Maybe it's something heat related?

seems to be a failed probed, or wire from the probe. Can you get
another probe and see if it still behaves this way? Also, check
the wire from the probe to the gage.

--
Bob Noel
looking for a sig the lawyers will like