Electrical F150 ECU in a Foxbody? Idle surge help

[93royalblue]

Chasing down a surging idle. It idles good when it’s initially started up cold. It surges and dies real bad on any warm start after that but once I hit the gas enough or drive it around it drives fine. I’ve done everything on the check list so now I’m checking out the ECU and I notice the part number comes back for a F-150. Could this be a rebuilt one or is the previous owner just an idiot. Would it even run if it had a truck ECU in it? I attached a video of the computer itself. Also there was a burn on the insulation where the computer goes. What do yall think?

 

[AeroCoupe]

What year car is it and what mods? You might be able to open the case up and see a if there is a service code.

Engine Post in thread 'How to identify EEC-IV'

Sep 1, 2025

Look at the service code on the PCB (printed circuit board)


Pop the cover off, and on the circuit board you’ll usually find the catch code (A9L, A9P, A3M, etc.) silkscreened in white.

It’s not always in the same place, but usually on one of the larger flat areas near the edge connectors.

• Noobz347

• 

 

[Noobz347]

My first thought is that if it's an HO ECU that it will work but that the harnesses are not the same between the F-150 and the Mustang.

Just plugging a truck ECU into a Mustang harness would not even be on my radar without verifying the pin-out.

 

[General karthief]

Thats a reman, no telling what it for.

 

[85GTStangGuy]

Have you tried scanning the QR code? Maybe that'll provide some insight...

 

[General karthief]

Have you tried scanning the QR code? Maybe that'll provide some insight...

Or maybe some midgit pronz
Happened to a friend

 

[Mustang5L5]

That part number is for the 60-pin connector itself. Ford used it on many different vehicles even though the engineering part number may come back to an F150.

You might be able to open it up and look for markings and such to ID it.