Today verified that it still didn't want to start. Then I soldered wires to the IGT, NE, G1, G2, G- and E1 pins on the back side of the circuit board of my spare ECU so could be assured of getting a good connection with the scope. I then unplugged the original ECU and plugged the connectors into the spare ECU and set up the scope to look at the IGT signal. Turned the key and it started right up. GRRRRR!
I can't pinpoint the problem if it goes away when I'm set up to look for it. Anyway I probed around for quite a while and everything I looked at looked like it should. I let it cool down while I did some other stuff. Came back later and removed my bypass of the NE, G1, G2, G- signals and reconnected the original connections. Then I swapped back the original ECU and tried it again. It wouldn't start.
I know, crazy that I'd think that's a good thing but I need to pinpoint this problem. So I jabbed a wire into the back side of the IGT connection at the ECU and setup the scope to look at it again. Turned the key and it started right up. GRRRRR!
I haven't added a ground wire from the ignitor to the ECU yet, that's next... after I find something to eat.