Take a look at the 120 second graphs of the CHT and EGT. After talking to Jabiru and GRT, I was told to look for RF interference or an open or corroded ground. I discovered that the #2 EGT lead was faulty. The thermo couple itself checked good for continuity, but the thermo couple to ground was open. Yesterday I replaced all four EGT probes and problem solved.
Interesting how one open ground can affect so many engine instrument indications.
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CHT & EGT Wild Fluctuations
Linear Mode
