pulled codes from computers
Fuel Injection - code 1 (no issues) returned

Base Module - host of errors, all pointing to blown fuses (F1, F2 and F3) in computer module. Pulled cover, checked fuses - all OK. Cleared codes. (Checking the list of items fed from F1, F2, & F3 it would seem likely if all 3 fuses were blown that I'd have a no-start situation)

EA/CC returned several codes, only one of which was listed as a valid code for that module. Cleared codes.

Pulled spark plug from front-most cylinder. Plug smells strongly of gasoline but is not fouled or terribly black.

From what I could gather on AllData, the O2 sensor can only be diagnosed with a "cycle tester" (not sure if I'm right on the name).

I thought that the DM (Diagnostic Module) which is referred to in AllData would have been the ticket to see what's what, but the pin in the X11 socket identified for it in AllData doesn't have a connector, so I guess my car doesn't have that module. (It's a very early '92 - vin ends in 023154).

I guess I'll try replacing the O2 sensor - likely it's the original one as the car only has 100k miles on it.

BTW, the plugs were those nasty Bosch platinum 4 electrode jobbies. Seems like I remember reading that those are best used to line the bottom of an ash can (at least for our cars) - what plugs should I be running in my M104?

Thanks for all the help thus far. PLEASE no more posts about Houston's air - they're not related to my problem. (Although with the gasses my car is producing, I'm surely a contributor to the situation.)