EGT spikes on one cylinder

[rv8ch]

I'm about 90% sure that this is a sensor issue, but is there any other reason for an EGT spike like this?

 

[storm_pilot]

Looks like a sensor to me. I’d swap it with another cylinder to verify if its the sensor or the wire running to it.

 

[penguin]

Likely to be a sensor issue, could be exhaust valve stuck open but that would have given other symptoms. Check all the connections for that sensor.

 

[Ironflight]

You’d have to work very hard to convince me that it is NOT a sensor (or connection) issue…..

 

[bjdecker]

If a sensor value defies the laws of thermodynamics, or would require a nuclear fuel rod to burst, then it’s probably a bad sensor…bad crimp, loose screw, etc.

 

[Dan 57]

did any of the previous mentioned that it could be the sensor?
If not, then have a look at the sensor

 

[BoydBirchler]

I had a similar issue and initially thought it was a plugged injector, but it was cured with a new EGT probe.

 

[jclark]

Before getting another sensor, I would say take a very close look at all of the CRIMPS and CONNECTIONS.

 

[DNeufeld]

Before doing anything, You might want to take the cowl off, turn on the engine monitor, and have someone watch for spikes while you move the wiring around.
Swapping out the part might hide the cause since you will be messing with the connections or inadvertently moving a short to ground that will come back.

 

[rv8ch]

Great tips - will give them a go this weekend and report back. Thanks!