Falling under the heading, the mystery that will not be solved....We are prepping the STI for the Cascade Enduro in case the weather turns nasty. (If it's great weather we are taking the 818R). All year we've had issues with cyl misfire codes in the STI. In the past the codes were caused by over winter gas + Boostane fouling the sparkplugs. So every spring we swap in new plugs. But this year we kept getting cyl misfire cels. We swapped in new plugs again in June but I got Cyl3 cel a couple of weeks ago at The Ridge. We also do compression checks after almost every race. So we pulled the plugs and checked the compression, it's fine. New plugs again. But this time we noticed this:
Coil Connector Zip 2023.jpg

WTF!?! Who "fixed" a failing coil connector with a zip tie? No one knows. It's possibly been there a long time, you don't have to disconnect the plug to pull the coils and do compression and plug swaps. And the connector looks toasted. It might be heat from the downpipe, or it might be the coil is going bad.

iWire has a blog post about using zip ties to "fix" a failed connector and a YouTube on how to replace it. https://iwireusa.com/blogs/iwire-uni...oil-pack-plugs

The fix: We've ordered iWire connector replacements, new coils, and new plugs for all 4 cylinders.