Ok doing V8 Swap in a 88 formula 5 speed.
install is sbc with holley projection 960 analog old type system.
GM HEI with MSD Retard controller 1 to 15 degrees.

Problem.
Dumb Ass Here sought out all needed wires for V8 cut the rest out at
fire wall.
Well Cut the, I beleive was the speedo wires.
No problem I plan to pull entie harness out from the fire wall to ecm
use heat gun melt the hot glue and remove the wires at there conection point at ecm.
So i Do this assuming I will just splice in and fix my screw up.
Purple wire and Yellow wire sholdn't be too hard.

Well there are 2 sets of purple and yellow wires.
so I isolate wire sets find the correct PUR & Yel for the speedo
and the second set run the fuel pump for 2 to 5 seconds when touched
together and then again when seperated.

Now I can't find this or the speedo set in wiring diagram.

Is this other set for the oil pressure sensor when the fuel pump reley fails?

And can I cut this out. I dont recall seing a second oil pressure sensor.

I dont think there should be any purple / yellow wires other than the VSS and the starter solenoid wires, so I dont know. GM usualy sticks with the same colors accross the board. If we're talking about the Fiero wiring, im all but positive. And the FPR backup switch in the OPS used tan.

Im more curious why the language censor didnt cover some of those words...

[This message has been edited by 86GT3.4DOHC (edited 02-08-2007).]

let me trace the wires and see exactly where they go.
Sorry about foul mouth.

Along the same line...

I swapped out the oil pressure sender on my SBC last night. The one in the car was not compatible with my VDO gage. The old one had three wires coming from it. One looked like it went to a relay, the other two to the computer.

I yanked the existing oil pressure sender, popped in the new one and ran a new wire to the gage. Started up the car and it ran fine for about 10 seconds or so, then quit.

Now, its quite possible that I ran out of gas, as the fuel gage is not hooked up yet and I have no idea how much gas is in there. I haven't filled the tank yet, but will tonight when I get off work. Can anyone tell me if the sender would have been wired to, say, the fuel pump or other such vital device, or is it more likely the car's out of petrol?

Bullrider, depends on how you wired it. originally the fuelpump relay was held picked by the ecm, and the wire form the oil pressure sender went directly to the fuel pump to run it in the event of an ecm/relay failure. it;s possible the quick fix of the sbc rewire was to use the oil pressure sender to energize the fp relay, and now it is not running at all.
is this a carbed non ecm setup? if so, likely that is what they did. just guessing now without knowing what you may have....

any ideas yet

Here is a screen shot of a wire diagram for a 88 gt
I see two runs of purple and yellow wire. One for an auto and on for a standard

------------------

" DRIVE IT LIKE YOU LOVE IT"

Well no answers yet.
I have not changed the fuel pump reley or the wires to it.
they are stock. new fuel pump 125 psi OEM for 2005 GTO empty tank not ready for that yet.
I have never changed any of the harness wires at all it is all stock.
with the exception of removing wires no new installed.
Piggy back Holley EFI is seperate in entirerty all sensors seperate no sharing at all.
I basicly removed the efi portion and dis from ECM use. this is all controled by
Holley projection, MSD HEI, MSD retard controller and an AEM back up with NOS controler
DUO sensors are water there are 4 now 1 fiero stock 1 fiero stock to guage 1 Holley and 1 for the AEM
oil there are 3 1 fiero stock to ecm 1 fiero stock to guage 1 to AEM NOS
2 tps 1 for Holley ecm 1 for AEM NOS controler this one is on cable side
1 fuel pressure sensor for AEM NOS to cut nos in event low fuel psi
Holley and AEM run High volt reley to up the fuel volt at WOT
There is a 4bar MAP for the AEM that controls the Blow off valve and waste gate on the Holset HT60.
I hope to get 40 psi WOO HOO
None of the computers/ECM'S have power at all except the staock Fiero.
They will via 6g monster wire when I pull my head out of my A$$ and get it wired right.

Thanks

OK, I'm joining this thread kinda late & I really don't get what you're trying to do.

So I'll ask a couple of questions.

You said you're doing a V-8 swap, before you cut all thoss wires off, did you watch my instruction video?

It recommends to remove the wire harness completely from the car before cutting anything off.

Archie