Solid Lane B Light

Read through my post titled "Lane A Fault - Ignition/Injection Driver."  It sounds familiar to what I just went through.

Thanks Jim.   

I had a failed  No 3 coil about six years ago, and those symptoms were very different to the current symptoms.  When the coil failed 6 years ago,  complete loss of combustion in one of the cylinders occurred with rapid drop of EGT to zero and an extremely rough running engine instantly when one of the Lane master switches was turned off (ie the same symptom as described in your post).   A new coil solved that problem. 

The current problem does not appear to be a failed coil because:

1. I switched coils 3 and 4 over and the problem remains exactly the same with 'Lane B Device Status Ignition Coil 4' persisting. 

2. the symptoms that occurred years ago when I did have a failed coil (ie same symptoms as yours) are not the symptoms now.

I wondered if the problem could be downstream of coil 4 and the 'Lane B Device Status Ignition Coil 4' annunciation is not actually specific to the coil itself but any component downstream of the coil (ie high tension leads or spark plugs). 

However even when Lane B master switch is turned on and Lane B red light is on, the engine still runs smoothly when Lane A master switch is tuned off, indicating to me that Lane B is still sending spark to its two coils (including Coil 4 and Coil 4 is  in turn is is still sending signals via high tension leads to spark plugs) otherwise the engine wouldn't run on all four cylinders like it is. 

I'll test and/or try replacing the high tension leads exiting Coil 4 next, but I doubt they are the problem given the above paragraph. What approximate value/range of resistance is normal when testing the high tension leads with a multimeter?

The symptoms and observations are not consistent with the problem being in Coil 4 itself (for reasons 1 and 2 above), despite the annunciation on the Dynon Skyview of 'Lane B Device Status Ignition Coil 4' .

I beginning to think the annunciation does not specifically indicate there is a problem with Coil 4 itself!  Is there anyone on the forum who knows much about the Dynon and what the annunciation 'Lane B Device Status Ignition Coil 4'actually means, or has any other ideas as to what to try next..

I can still fly with solid B light on (albeit using 25% more fuel which I assume is caused by either Lane A or Lane B using a 'safe mode' whereby it provides a significantly greater quantity of fuel to combustion chambers ).  With both Lane A and Lane B master switches on and solid Lane B light on, if Lane A master switch is turned off, after a very brief (milliseconds) period of engine hesitation, the engine returns instantly to smooth operation, indicating to me that despite Lane B solid light on and Lane A inoperative, Lane B is still capable of controlling spark and fuel injection (otherwise engine would stop) 

Any other ideas as to what to dry next would be appreciated.