Running ignition wires for turboswap directly to Comp. insteadof using factory wiring

[KenneBell]

The engine just will not run with the spout connector in and misses with it out, and I am getting an erratic PIP code in constant memory. New distributor, New Coil, New TFI, New ECM so wiring has got to be wrong. I am planning on running wires directly from the TFI to the computer, the only wire that goes to the TFI that does not go to the computer is the red/lt grn wire. Where should I hook this one too? I know it gets spliced into and run to the positive side of the coil but where else should it go? Thanks Stinger!

 

[Dr_EluSivE]

honestly... Go to the junkyard and get a Engine harness from a mustang, Repin it, and try that, running wires directly to the computer is going to be a royal pain, and shouldnt be needed, Something is wrong with your harness, or the way is pinned.


Dr.

 

[KenneBell]

I have been to every pick N pull within 60 miles of my house and not 1 has a 91-93 4cyl mustang, so I can't get another harness, also running the wires to the computer is merely temporary to diagnose if my harness is bad.

 

[Stinger]

If you want to know if the harness is bad, go to gt350r's site and download the pinout voltages paper...then check all of yours...

 

[KenneBell]

None of his links work, grrrr. Where else does that red/lt grn wire go besides the pos. side of coil? Thanks

 

[stackz]

have you looked on ebay for a harness?

 

[KenneBell]

No luck on ebay either, only 2.3 harness on there is for an 89 and I need one from a 91 -93.

 

[SVOconvLX85]

Let me see if I can get one from a junkyard around here. If so, I'll let you know. Sound good? There are all kinds of 91-93's around here.

 

[KenneBell]

That would be awesome, could you also get the IRCM module labeled N if they have one? I will pay you whatever you want Thanks so much. Let me know what you find.

 

[Stinger]

The red/grn wire goes to pretty much every sensor under the hood...it's the signal return aka sensor ground system.

 

[KenneBell]

Just a question but if that wire red/grn is the sensor ground why does it hook to the positive side of the coil and there is no red/grn wire going to the computer?

 

[nicklats]

The red/grn wire goes to pretty much every sensor under the hood...it's the signal return aka sensor ground system.

what could cause a sensor (or the coil) not to be grounded once the key is in the cranking position??

 

[Stinger]

Honestly, I'd have to dig out the diagrams again and check. I'll assume that the one that goes to the coil isn't one of the sig returns (as there are like 20 sig return wires). As for why they don't run to the ECU...they do...they all terminate into one wire "block" in the harness, then a single wire goes to the ECU.

nicklats: Most likely it's because the above mentioned wires are not all tied together which is causing an open ground for the sensors.

 

[Asha'man]

edit: double-tap, stangnet is stupid.

 

[Asha'man]

I twisted/soldered all the red/green wires together when I removed the coil pack plugs and wiring. No ignition problems yet.

I have like three DP/DIS ignition harnesses lying around; I was collecting them for a while in case I screwed something up on my main one. PM me if you want one.

Brian