Resolved CubCrafters Lycoming cc363i erratic RPM and now running rough on R lightspeed ignition

[Cubonaut875]

That is crazy that it would happen again to the same coil pack! Very odd. Something to keep a double check on for sure.

 

[Neal]

That is crazy that it would happen again to the same coil pack! Very odd. Something to keep a double check on for sure.

I’m hoping this is the lone original coil pack. Three were replaced.

 

[Cubonaut875]

Keep us posted!

 

[Neal]

It was a bad coil pack. Ohm test at 3 Kohm, normal is 16. It was a new coil pack from lightspeed date code 0824 from last November. As two I pulled that were original and I marked “likely good” ohm checked good and installed instead of another new one just because I think it’s still good. Engine run tests perfect. IA was on board for verification and sign off with treat bribes. Obviously mutt muffs are not working. Trying her with the new Rex specs hearing protection for dogs. I think the one I got is too small so tried these again. I digress.

Approximately 1.5 hours to decowl and replace coil pack. Now to reassemble

 

[Tsquared]

I’ve been planning on ordering some spare coil packs but haven’t pulled the trigger yet. I’m very interested to hear what the Mfg has to say on why such a new coil pack with so few hours on it failed. It has me thinking I should delay any purchase to avoid getting a few from that same batch.

Nice to see the pup supporting your maintenance efforts.

 

[Neal]

This mfg tends to blame everything else first so you're not going to get an answer. Order two and stow and hope you never need them, maybe someone around you does and you'll save the day.

 

[ve6yeq]

I don't remember the message and I haven't been running my GoPro's but last night I did just in case it came on again and I had to seek support for it. It's happened about 3 times now, I think it's yellow large letters on the ADSB screen of the GNC 355 that I'm typically on and in the transponder section at the top left of the G3X. I'm hoping it's stray trons from the coil pack but I'll continue to monitor.

I am seeing the same issue on the GNC 355. It seems to appear more often when there is no other traffic anywhere in range (Canada does not have ADS-B ground stations like the US so I get weather, notams, etc. via SirusXM). I wonder if there is a shielding issue on the Ethernet connection that makes it sensitive to electrical noise?

You may need your transponder firmware updated. It's the one thing we can't do ourselves, supposedly per Pete. Avionics is supposed to do the updates on this. I'm coming due for my every two year transponder cert so I need to check versions and consider having them update it.

I have the GTX 45R and the firmware update is possible as the windows software to update it via USB (USB connector is under the panel just behind the USB power) is available on the Garmin site. I need to install a Windows VM on my MacBook Pro and see if the USB will connect.

 

[Neal]

I've only seen the issue a few times, not sure the cause, maybe asking on the CC Facebook Official Support page you can get some answers or other people to chime in what they've seen.

I've seen that USB dongle but Pete said it was for Avionics to do but yeah, I was tempted to try. Let me know how it goes. I think it may be due to that the transponder has to be "certified" every two years and if you screw something up you may not even know it. I don't know, I'm new to all of this but I do like to try to keep things up to date as much as possible.

Maybe emailing g3xpert would be something to try as well?