912iS Coil Reliability

With about 5000 hours on various 912iS I have been through 4 coils now. Double that for EGT probes. Hopefully the new part number 665613 is improved. Only the old 665612 have failed on me so far. Now I keep a spare.

As far as Dynon verses dongle, my last coil failure, the Dynon read #3 was bad, the info from the dongle said the #4 was bad so I went with the dongle data, replaced the coil with my spare xxxx3 and that fixed it. After numerous times trying to figure out the  cryptic codes the dongle download provides, you match the lane problem/light to the spark plugs and the proper ignition coil is pointed out. This works.

So the moral of the story is the dongle is better because the Dynon I have had experience with must have been hooked up wrong since it gave the wrong coil as the problem. 4 coils in 5000 hours is a problem but better than carbs.

According to my LAME, a coil error can happen if there is any problem downstream of the coil, or at the coil. So, it could be a spark plug, a plug cap, where the lead goes into the cap, or where the lead goes into the coil. The lead coming off is the most common problem. The leads are twisted onto a self-tapping screw ? to keep them in place, and this is the most common cause of the fault. 

I carry a spare coil, spare cable, spare plug caps and spare spark plugs. I am going to get the old coil checked. Thank you for the replies!  

Yes wiggling the wires, tightening the connections is always the first try and mysteriously sometimes appears to temporarily solve the problem. Yes also the EGT connectors. Have chased this "electrical connection problem' many times. But most every time it comes back with the coil change is the final permanent solution. Usually my last resort when the "electrical connections" would be nice.  Now that I have a spare dual/coil, i change it out as a typical troubleshooting procedure.

On another similar situation, have had more electrical connection solutions with the manifold pressure connection of which the pricey clips have solved that.