We have one cylinder A03 that has high exhaust temperature causing the engine to derate. I am new to these engines and any advice would be greatly appreciated. I have read something about valve clearances.
Does your engine have peak pressure sensors on the cylinders? If so, a failing pressure sensor could cause this. The press sensor can read lower than actual, causing more fuel to be injected to raise the pressure up, which results in higher exhaust temperature. This is a common way a peak pressure sensor fails.
Check your MFI Duration Offset as well and see it it increased along with increasing exhaust temperature.
(Natural gas units)We usually look at coil voltage first. If outputting high then replace a plug. We check the quick and easy things first. If still dropping out check bridge clearances and adjust valves. We are currently dropping cylinders and looks like may be plugs(if gas units). We are also approaching a maintenance interval so could be a combination of things. Have noticed that the plug gaps get pretty large at a couple of thousand hours of running.