I have an 85 w/ the same wire cut. I was told it is the hood light wire. The hood bulb is right above the wire.
Also, I did the same conversion w/ the same adapter & had problems. Is your cam sensor cap working properly? Those tend to die for some reason, it’s common. Casper’s sells a nice tool...
Go to VORTEXBUICKS-ETC.COM & you will find the no start tree there. That site is very helpful from pin-outs to how to test different electrical components.
I am new to the turbo Buick life. I bought a 1985 T-Type that a mechanic hacked together. I’m trying to fix it. My throttle body has what looks like a vacuum port on the forward facing side of the throttle body, nothing is hooked up to it. Can anyone tell me what is supposed to be attached there?