Behold the wandering EGT!

[Wildhorsetrail]

On my last flight, EGT on cylinder #3 was feeling footloose apparently. It wandered up into the the normal range at times but mostly went up and down in a range 500-800 degrees below the normal. I tried a couple of mixture settings but it was still dancing to a different tune. Anyone experience this? Not really that concerned about it but would like to know if it looks like a new probe is needed or if something else is afoot. CHT remained normal.

[DXB]

Probably needs new probe, but check/tighten the connection to the harness first, maybe put a little stabilant 22 on the connection - this worked for me once when I thought the probe was toast.  EGT probes go bad commonly.

[Vance Harral]

I've had this happen numerous times in the dozen-ish years we've had an engine monitor.  Sometimes it was a bad probe, but other times it was just a broken thermocouple wire.  Mine happens to be an Electronics International system, and EI has changed the connectors they use for thermocouple wires a couple of times.  They won't admit it's due to the older connectors being prone to wire breaks at the crimp, but that's almost certainly the reason.

[WAFI]

Defiantly check the connections. This happened to me just after installation and it was a loose connection. Zip Tie, Zip Tie, Zip Tie

 

I'm a big fan of Grip Lock Zip Ties, check them out.