Quote:
Originally Posted by IraHayes
Whatever happened with your car? Any updates?
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Sorry been away due to general life upheaval due to coronavirus.
Definitely owe it to anyone that was tracking this with me, and perhaps someone that might encounter a similar issue in the future.
The problem was....
a faulty crankshaft sensor! 
Long story short, the first shop I took it to was either incompetent or simply missguided. I stop short at accusing them of trying to steal my money, but my wife certainly feels that way.
I had it towed to a BMW dealership and they had it fixed within a couple of days. The service advisor took a look at everything I have showed you guys in this thread, and knew the first thing to try right away.
The busted spark plug and the piston float scenario are all now just mysterious and suspect. I still don't have a definitive answer for how or why those occured. Some here suspected a faulty plug install... and maybe with the detonation from the crankshaft losing synchronization it was just a perfect storm.
Either way, it is fixed now and my F31 is back on the road "strong like bull".