1993 Mustang 5.0 Engine Swap

by Roger Henson
(Oklahoma city)

1991-1993 Wiring

1991-1993 Wiring

1993 Mustang 5.0 Engine Swap Question:

I have a 1993 Ford Mustang coupe with a 4 banger (4 cylinder) and AOD (automatic overdrive transmission).

I pulled the old 4 cylinder motor and tranny out and installed a 5.0, AOD out of a 1989 Mustang hatchback.

I got the ecu wiring harness with the 1989 engine and transmission and I pulled the ecu wiring harness out of the 93.

What do i need to hook up the 1989 Mustang harness? Or is there another direction I need to go?


First off, I'm assuming that you already have ironed out the details for motor mounts, driveshaft, fuel lines, radiator, map sensor swap and of course mating the basic starting circuit to the new engine.

So we'll strictly address the engine and transmission wiring part of your 1993 Mustang 5.0 Engine Swap.

I can't give you a definitive answer as to whether the harness swap will be exact, since Ford loves to change vendors, and try to keep you attached to your local dealership service department, but here's how to approach it.

The first thing you need is a copy of the ECU wiring diagrams for both, the 1989 and 1993 Mustangs. While the 1989 to 1991 harnesses are virtually identical, the 1993 is not. For instance, the wiring colors for the map/baro sensors have only one of the three wire colors in common. But that just means a little more homework!

The good news, is that you are
working with two harnesses and ECU's from an automatic car.


1. Trace all color codes from the stock 1993 ECU outputs, to their respective parts.

2. Verify, using the 1989 wiring diagram, any changes, due to the model year differences that may exist and label/change them to match. I've included a pinout diagram for the 1991-1993 V8 ECU for reference.

3. Check the lengths of the wires for fit. What I like to do, if the color has changed and/or the length is different, is to splice the new wires somewhere before the connectors, so that you can tell at a glance looking at wire colors, which one(s) you have.

4. Once you have verified the wires and where they go, it's time to check connectors. The important things to look for, on your 1993 Mustang 5.0 Engine Swap are pin location and grounds.

I've done several re-wiring jobs on various Fords and even one year to the next, which externally look identical, can have connectors with reversed pin locations and of course different colors.

5. Transmission members should fit, but if you are going from single exhaust, like a typical 4 cylinder to a full dual exhaust, you may want to use a 1993 V8 double hump crossmember, to make clearance for the other exhaust pipe.

If you need further explanations, go to the comments section below and we can add to this thread.

Good Luck!

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93 Cobra drivetrain hunt
by: Will Butler

I have a 1993 Mustang 4 cylinder LX hatchback with an automatic overdrive.

My plan is to swap the drivetrain with a 1993 SVT Cobra drivetrain. Do you guys know any wrecked 93 Mustang Cobra's? I also want to put in heavy duty suspension with Monroe shocks and springs all around so the car can handle and take jumps (not big jumps).

Let me know if any of you find any wrecked 93 Cobras. Thank you

1993 Mustang 302 V8 Into An 82 Supra
by: Jd


I've got a 82 Celica Supra, and I found a engine and transmission out of a 1993 Ford Mustang GT.

Since I have the supra shell I figure why not. I am trying to figure out how to get the wiring right on the car. Can anyone help?


Although I haven't done a 1993 Mustang 5.0 engine swap into a Celica, ya gotta know it's gonna be faast!

The nice thing about using the 1993 Mustang 5.0 liter, is that the components are pretty basic. No anti-theft system to jerry-rig to get it going.

Probably the simplest way to go, is to use the stock Mustang steering column and adapt it to the early Celica.

That way, if you have all the wiring from the engine to the computer and back to the steering column, including the starter solenoid, battery cables etc. you should have everything you need to get it up and running fast.

If you don't want to use a 1993 Mustang column, you're going to need to get a wiring diagram for the 93 Mustang 5.0 and one for the 1983 Celica and match the column wires for the ignition and starting circuit.

Not a tough one, but a bit more time consuming.

All the best on your 1993 Mustang 5.0 engine swap into your 83 Celica.


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