912 iS Sport EGT Differences and Coil Problem?

A 60 degree variation between EGTs is typical and nothing to worry about.  This can be as simple as sensor error, a slight differences in airflow through the airbox to each cylinder, or airflow differences in the engine cowl.  My 912iS has a similar variation.  As far as your lane warning light, it’s reasonable to suspect it’s heat related, but you would get more help here if you post the BUDS Fault log.

 A coil error can be a problem with the coil itself, or downstream of the coil.  So check the connections at the coils, and your plug wires, making sure the connections at the spark plug boots are tight.  The boots screw on, so you can give the boots a right hand twist and make sure they are tight.  If the connection is loose and won’t screw down tight you can remove the boot, snip off 1/4” of the plug wire then screw the boot back on.  

I downloaded the engine data into a log file. Who do I send it to? How do I send it?

I ran the engine again to see if I could duplicate the problem..

Sure enough after a few minutes the coolant temperature reached about 87C, then I got a "land immediately" message on my Dynon Skyview and a steady red light on Lane A. I recycled the Lane A switch and increased engine rpm to supposedly increase underhood cooling. The light stayed off.  I do not know what the engine is doing.

I am becoming extremely uneasy about the serviceability of these engines because the softare and diagnostic systems seem deliberately complex and inaccessable  to a builder. Having to spend $1000 for a proprietary dongle just to read the logs and still not be able to interpret them is not optimal because we have no idea of the severity of the faults and rotax doesnt seem to want to tell us anything without paying $$$$ for information.

OK, calmed down and done a little more research and a look at the log file.....

The failure message i get that is different from all the junk that seems to repeat itself is:

"Lane A failure actuator (ignition cyl 3 and 4) -TPU test - nominal current not reached"

Can anyone please explain what that means and what to do about it?

Also, if that is  the fault, by cycling Lane A and the light foes out, is the igntion working correctly now or has the ECU locked it out and is just relying on lane B plugs for those cylinders?