I have(had) a 91 RS with a v6. I put a 350 TPI in it. The engine + wiring harness + CPU is from an 87.

Heres my situation I am so close I have 3 wires left! and just cant seem to figure this last thing out. I turn the key and the engine turns over wants to start but does not stay on(not sure if its because power going to computer or something). The fuel pump does not turn on by key.

I am using the bulkhead connector from my 91 and just cuttin the bulkhead off the 87 and putting it to the matching wires from the 91 Bulkhead. These are the few wires I have left. And The problem I am having is the fact that the fuel pump will not turn on by key, it turns on when i connect direct hot to the (G4-GRY wire) on the bulkhead. So i know the fuel pump works but where do i have to run the GRY wire to on the 87 Wiring Harness. Also what wire controls spark?? Oh and is the v6 Fuel pump good enough for the V8 fuel pump?

91 Bulkhead Wires
G4- Fuel Pump(Gry)
A7- Emissions Control(PNK/BLK)(???? is this even needed????)

87 Bulkhead Wire
G7- Computer Command Control(???? is this even needed????)

I will be checking my messages tonight(Nov 9th) and early tomorrow (Nov 10th) around 4:30-5:30a.m. after that I wont be home until either saturday or sunday, the car is at a guys house that i work with, i will be there working on it and finishing up odds and ends, if you figure something out or have any input/tips after Late nov 9th early nov 10th. i would really appreciate it if you could give me a call my # is 1-860-268-4007, i work 6-2:30, during the day i can answer the phone sometimes depending on how busy i am, if i dont answer just drop a message and i will call you back
thanks!
Thomas

 

will it run if you keep your foot on gas if not check the iac valve if it has one
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will it run if you keep your foot on gas if so check the iac valve if it has one

 

you need a speed density 730 computer and prom.

 

YEAAA BABY!!!! i got the engine to run!!!!! i wired the fuel pump threw the fuel pump relay output, a there are a few things left that i have to figure out.

1. The Cooling fan does not turn on, ill be able to figure that out or ill just make it so it turns on by the key
2. Going from the 91 bulkhead out, the torq converter clutch(auto overdrive) where does that go to on the 87 harness.
3. On my v6, the fuel pump made the humming sound when u turned the key, then it shut off, the way i have the fuel pump wired now on the v8 87 harness the fuel pump stays on all the time, but when you turn the key its a louder humming then it dimms down to a lower key humming, is it supposed to ever stop?
4. On the 91 bulkhead going out, my Inflatable restrant(blk/wht wire) where would i hook that to on the 87 harness?(not needed but figured id get it hooked up the right way)
5. And the 87 harness had a wire called computer command control that went into the bulkhead but i can not seem to figure out which wire it would connect to for the 91 bulkhead or if it is even supposed to run threw the 91 bulkhead.

I believe thats it, i forgot the list at his house but rest of the stuff is not "manditory" to have the car run and can be done at a later time.
When that car fired up we both almost hit our heads on the 12' ceiling cuz we were so excited and it was wicked loud!. My only advice to people who does the v6 to v8 swap as of right now is make sure you have a lot of time, Diagrams of both engines wiring connectors c207, c221, Computer, And Bulkhead(c100) connectors. Another big thing would be to get an engine from the same year so the wiring is almost exactly the same!!!!! so you dont have to trace wires for a week straight and figure out what goes where and oh this connector isnt even on my 91! lol

If anyone has any answers to those following questions, i will not see the response until thursday or friday, so if you would be so kind to give me a call my phone # is 1-860-268-4007, if its long distance for you, we can hang up and i will call you right back.
Thanks everyone
Thomas