CHT sensor anomaly

I think you found where the problem is, you said. 

"We exchanged the cables between CHT1-CHT2 = the values just exchanged, but the problem remains."

It sounds like a wire/wiring problem, does it not?

Hi, thanks for your reply, unfortunately not. By the wires change between the sensors the wrong indication also changed from CHT1 to CHT2, but in reality the same Head 2 remains affected, no matter how we changing the cables.

Do you have a instant reading non contact/laser ir thermometer to verify the temperatures on the ground as it warms up? Or have you tried that? To verify actual head temperatures.

https://www.testequipmentdepot.com/fluke/thermometers-and-humidity-meters/infrared-thermometers/infrared-thermometer-62max.htm?ref=gbase&gclid=EAIaIQobChMIj9Tq7eLo6QIVA4TICh0--AgLEAQYASABEgKZq_D_BwE

We did measured them with small differences, but nothing marginal -+5 degrees. The indication difference was almost 50 degrees of Celsius, after high RPM setting they get equal (the affected CHT sensor went back to normal) and they stays normal until the next cold start of the engine.

So are you saying that you measured the head temperature during warm up with an independent/different instrument and not the Dynon? And when measured with a different instrument the results are the same?