Absolutely stumped with the crank-no-start I've been struggling with for 3 weeks

[rogerscgreg]

The issue resurfaced last night. I had came to the incorrect conclusion that it was the DME since it fired with a known-good DME, but when I bought one for myself instead of using a friend's temporarily, it didn't start until I twisted the harness/connector around a bit. It dawned on me that it was likely never the DME, so I plugged in my old one, twisted the harness around a bit, and it fired.

Now that I've pretty much confirmed that it's an intermittent continuity issue, I'm going to probe each critical pin on the connector and pierce probe each corresponding wire as close to the firewall as I can get and see if twisting affects the continuity.

[reelizmpro]

I'm late to the party but wanted to share my own experience with this sort of issue. I was going to suggest CPS also and not just any CPS but a factory BMW one. I tried an aftermarket and sometimes it would start and sometimes it wouldn't. I also had an issue where heat from the turbo/exhaust frying the ignition coil harness and I couldn't see it because it was wrapped up. As old as these cars are the wiring has held up pretty well over the years but is often overlooked.