My engine monitor has started acting oddly recently. My number two EGT has started going up and down about 10 degrees. This is fairly obvious in normalize mode. From what I read a failing exhaust value tends to fluctuate more than this and is more rhythmic in the changes. Here's a video of it.
http://youtu.be/qUfwuRC132g
You'll probably notice that EGT 1 is absent. The probe died on me on the way to Oshkosh and has since been replaced and is working well.
My thoughts are that this is an early sign of the #2 probe going bad, some other wire harness issue, (in distant 3rd) the exhaust valve slowly biting it. I tried switching the #2 and #4 EGT probes but wasn't able to reproduce it on the ground. Anyone else have any thoughts on this?