912iS Coil Reliability

by Andrew Nielsen in 912iS Technical Questions 2 years ago

I have had my 912is for about 400 hours in about four years. In that time, it has had three replacement coils. Coil 4, coil 2 and now coil 4 again. The part number for the coil is 665613. The old part number for the same part might have been 665612.

I was thinking of getting two replacement coils instead of just one, if they wear out so quickly and make the plane unserviceable. The retailer/distributor for Australia, Bert Flood Imports, said that there is ongoing demand for coils but that there was ongoing demand for the other bits of 912iS's, too.

Am I just unlucky? Are the coils really this consumable? Am I replacing them for nothing? Should I always have one in the back of the plane?

I diagnosed the fault as follows. The lane light came on (solid, not blinking). I pressed the Engine button on the Dynon and then the Faults button and it said it was coil 4, if I remember correctly. I have a dongle but have never used it. Would it give me more info?

Thanks!

Re: 912iS Coil Reliability

by Paul Hamilton » 2 years ago

Paul Hamilton

31 148 343

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.

Thank you said by: Andrew Nielsen

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Re: 912iS Coil Reliability

by Andrew Nielsen » 2 years ago

Andrew Nielsen

14 21 56

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!

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Re: 912iS Coil Reliability

by Paul Hamilton » 2 years ago

Paul Hamilton

31 148 343

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.

Thank you said by: Andrew Nielsen

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912iS Coil Reliability

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