During runup today the Dynon voice started nagging, "Cylinder Head Temperature". Sure enough #1 was shooting up toward 490. I pulled back power and it came back down pretty quickly. I slowly put power in again and sporadically the temp jumps back up. EGT reads nothing out of the ordinary within a few tens of degrees from all the other cylinders. I'm figuring a bad CHT probe so I taxi around a little bringing in power and pulling it back.
Temp consistently goes way up with power and comes back down to the level of the other cylinders (low 300s) when I pull power back to idle. EGT is in lock step with the other cylinders. Switching mags seems to do nothing unusual. Went back to the hangar and pulled the cowl. Nothing visually out of the ordinary with the probe or anything else.
I'm not so sure it's just a bad probe. When a probe fails wouldn't it likely read lower temps? What real engine problem might present these symptoms?
Temp consistently goes way up with power and comes back down to the level of the other cylinders (low 300s) when I pull power back to idle. EGT is in lock step with the other cylinders. Switching mags seems to do nothing unusual. Went back to the hangar and pulled the cowl. Nothing visually out of the ordinary with the probe or anything else.
I'm not so sure it's just a bad probe. When a probe fails wouldn't it likely read lower temps? What real engine problem might present these symptoms?