EGT gauge spazzy.

[Adam Frisch]

So, on flight today the left digital EGT gauge starting acting up - went down to a very low temp and then up to reading correctly again etc, but was mostly stuck on . the low setting. After some power changes it seems to quicken to and come back and show correct again, only to after awhile drop down to radon low number again.

A problem that's common after sitting for awhile, perhaps? Should I just clean the cannon plugs? Anyone experienced something similar?

[Steve binnette]

I had an egt gauge that was jumping around.  A spray of contact cleaner on the canon plug fixed it up for a while.

Ultimately i had that cannon plug repinned since it came back after a few months. 

Look at the condition of the plug and try to clean it up.  That might work for you.

[donv]

One of mine did that as well. It ended up being the EGT wiring harness, which was replaced during the hot section. Now it works perfectly.

[Adam Frisch]

Thanks for suggestions! Yes, I spoke to Stan Perkins (who I've been trying to participate here for years) and he said that it is most likely the cannon plug in the firewall by engine. He's had it happen a few times on his 681. So I've asked them to spray and clean that and also look if harness looks damaged anywhere. Hope that will fix it.

It was a little unsettling initially as it happened right after 2nd takeoff on the upwind and for second I thought I'd lost an engine, but the torque meters were still showing power and no yaw, so quickly determined it was the gauge.

[Adam Frisch]

As expected, cleaning the thermocoupling bananaplugs in the firewall took care of problem. The old girl is now safely back at home base. Now I just need to clear the hangar from all the crap to fit her!

[JimC]

I'm really looking forward to meeting you and your bird out in the wild somewhere!