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Could it be that hot air is leaking out of the spinner to cowling gap and
warming the boundary layer? Try sticking the probe out farther to get it
into clean cold air. You can also swap with another channel to eliminate the
electronics as the source.

The other day I had one cylinder head reading high. It came on suddenly so I
suspected the probe. To test this I removed the CHT probe and it's neighbor.
I put them next to one another and wrapped copper foil  around the tips. I
then heated them with a torch and watched the CHT gage. They tracked
together so I knew the problem was elsewhere. It turned out to be a weak
magneto that was allowing the cylinder to detonate.

Regards
Brent Regan

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