O-320 E2D Cylinder 3 temp lowers at WOT

[jeffsvan]

Team,

I searched the Forums and did not see any posts referencing my issue:

Just noticed a possible abnormality.
While running 70% or less, I have even CHT and EGT across all 4 cylinders.
roughly 1400 EGT, and 310 CHT

But when I go full throttle or above 75% I am seeing cylinder #3 getting cooler temperatures of about 1280 degF, and the other cylinders go up to 1500. When I pull back to 70% they all even back out at 1400.

My plan is to switch the probes on my engine monitor and see if the problem remains or follows the probes. Maybe I have a probe going south.

Any ideas? Is there a possible issue I am not considering?
thanks

[ColoRv]

Have you performed an induction leak test in flight?

https://www.savvyanalysis.com/articl...ht-diagnostics