hmm... since I have the whole car, I think I'm going to drag the whole wiring harness out of it and see if I can get it going with everything intact. I dont really care if i have to find a place to put the BCM and all the extra wiring, as long as the thing runs. I even have teh ign sw, so I might be good to go for now. It's only going into my nova, so it might even be cool to just route the whole new wiring harness where it all goes (lights, etc) in it. I can then work on cleaning out the stuff I don't need. I would think that the more of the envoy I put in the nova, the better I am as far as the short term goal of getting it moving the car.
I've never done any reverse engineering, has anyone asked the guys on the diy-efi list? I'm a programmer, but those guys are way over my head a lot of the time. Maybe someone can suggest a way for me to monitor the BCM-PCM data line when/if I get it going to see what it sends?
