Jeff
When I first ran my IO360-A1B6 I had a pmag problem that turned out to be the coil. since you swapped out the 3-4 wires and it didn't follow the wire, then it is likely not the ignition.
Maybe I missed it, but when you are getting the 60 rpm drop, you are running on the mag or does it have the 60rpm drop on both?
On my set up the mag plugs are on the bottom. they are more prone to fouling. with ignition problems to start and then high oil temps after first flight, I didn't get a good ring seating and had high oil consumption which has settled out after 75hrs but short story is the bottom plugs get most of the fouling. It can be firing, but weakly or intermittently. You can be get a situation where it is not firing consistently reducing the egt. with both mags running it runs fine with normal egt.
Clean / change the mag plug and then try your run up at around 1800 rpm.
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Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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