will an engine monitor diagnose "morning sickness"?

[rbridges]

I never heard of it until today. Someone said my plane sounded kinda rough when I started up at his airport. He has a mooney with the same o360 as mine, so I figure he knows what it's supposed to sound like.

I looked at some old engine data, but nothing newer than 5 months ago. From what I read, the egt should be low in the culprit cylinder, correct?

If my egt and cht are pretty even across the board on startup, can I still have a sticking exhaust valve? I plan on going to the airport and dumping my data from the UBG16.

 

[yetti]

Turn the propeller by hand and see if you have soft cylinders

 

[timwinters]

No...it's my experience that morning sickness doesn't last long enough to be picked up by the monitor. At least mine never did. Mine was gone in 15 seconds or so, long before the EGTs were hot enough to register.

 

[JohnAJohnson]

A friend of mine a few hangars down had morning sickness in his 320 a month ago that would last 30-60 seconds or so, and it was repeatable from day to day. We pulled the data (JPI 740) and it clearly showed low EGT and CHT on the culprit. So it was useful to get us on the correct jug. Any quicker than 30 seconds as Tim discovered and it probably wouldn't have been helpful.

As an aside, my O-360 runs rough on startup this time of year for 10-15 seconds, but the EGTs and CHTs for all four rise together. It's just "cold" sickness.

 

[PaulS]

I don't think she'd put up with the probe myself, generally they feel better after the first trimester.