Ignition troubleshooting - Help!
 

I must have missed something... Here's the problem:

After my '87 325is sat for three months, I started it up. The car ran perfectly for about 5 minutes and then just died. Cranks fine, but won't even begin to catch. I disconnected the coil from the distributer, mounted the wire so that it was 1-2mm away from ground on the engine block, and cranked. No spark. I disconnected the DME, manually connected coil ground to car ground, broke the connection, and saw a spark between the distributer wire and engine ground. So the problem must be related to the DME. Changed the main rely - no luck. I did all the DME electrical tests in Bentley. Everything was fine. The resistance between the reference sensor wires was fine. I cranked the engine and saw the reference sensor resistance fluctuate, so I'm almost positive it's not the sensor, but I don't have an oscilloscope to view the wave pattern, so I can't tell for sure.

The only other thing it could be is the DME itself. I have a Bosch 153. I just got a 173 from a junkyard and no luck. Still no spark coming out of the coil with the DME plugged in and the engine cranking. Reading the code from the 173 I get 1444, which I understand means all good.

Help! I need to take this car back to school in a couple days. What have I missed? Thanks!