I have almost completed the monumental task of going from carb to TPI on my '86 Sport Coupe. I managed to purchase an allegedly complete TPI setup of an '86 on Ebay and this was my starting point. I am finishing up the electrical connections this weekend and have a couple of questions that I cannot answer from any of my manuals:

1. A two-cavity connector protrudes from the ECM harness at the firewall at about the same location as all of the relay connectors on the driver's side of teh car. Wire colors appear to be black and tan, both solid. What does this go to? I can find no reference to this connector on any of my schematics.

2. A small, round, two-cavity connector protrudes from the ECM harness on the passenger side about even with the coolant return tank. Again, what does this go to? I can find no reference to this connector.

3. I have a separate connector at the ECM for the power feed for the two injector channels. The two pink-black wires go to the fuse panel and get ignition-switched power. Where does the brown wire go? My schematics don't reference this separate connector and the brown wire doesn't show anywhere relative to the injector drive circuits. I seem to remember that I saw this wire in a boneyard donor connected to ground. Can anyone verify that for me?

I am using a Chevy Shop manual, a Clymer manual and a Chevy assembly manual as reference and have run out of ideas. I would likely suspect that the harness is newer than '86 but the connectors for things like the A.I.R. control valve don't match the newer-style connectors so I am not sure about the providence of the harness.

I am very close to getting this thing fired up this weekend. Any responses would be very much appreciated.

Thanks!