Wiring Harness difference 93-94.

jclose11 · Aug 13, 2019

I need some help. What is the difference between the wiring harness 1993 and 1994 mustang gt.. I just bought a megasquirt computer for up to a 1993 mustang , but I have a feeling its a 1994 wiring harness in my car the mass air plug is different then the stock fox mustangs I've had in the past. I'm hoping I can still use the Megasquirt in my car.

Mustang5L5 · Aug 13, 2019

Mass air plug is the same. I actually run a 94-95 MAF on my car.

Quick way to tell is BAP/MAP plug. The sn95 cars don’t have it as the ECU has the sensor internally

Pics of the plug?

Dan02gt · Aug 13, 2019

I would find it hard to believe someone used a '94 harness in a '93. They are way different. The distributor plug is different because of the remote TFI, the location and type of a lot of the connectors are different. It has a CCRM to run the electric fan and AC. There are no salt and pepper 10-pin connectors, but there is a bolt down junction on the firewall to allow the engine part of the harness to connect to the rest of the harness.

jclose11 · Aug 13, 2019

Pictures

Mustang5L5 · Aug 13, 2019

It's fox wiring harness.

It has a 1996-02 4.6L 6-wire MAF wired in. You also have 24# injectors. You can still MS it but just need to ID the MAF transfer function for that particular MAF or change it to a known unit

What tune/chip/ecu is being used now to make that all run. If it runs well, must have some sort of custom tune on it now

jclose11 · Aug 13, 2019

Mustang5L5 said:
It's fox wiring harness.

It has a 1996-02 4.6L 6-wire MAF wired in. You also have 24# injectors. You can still MS it but just need to ID the MAF transfer function for that particular MAF or change it to a known unit

What tune/chip/ecu is being used now to make that all run. If it runs well, must have some sort of custom tune on it now

I have no Idea just picked the car up, and the guy knew nothing about it.

Mustang5L5 · Aug 13, 2019

Time to pull the ECU out and see what's going on.

If you are going MS, you can delete it anyway and just run speed density, or you can leave it and tune it with MAF.

MAF Transfer Curves / EFIDynoTuning

jclose11 · Aug 13, 2019

Mustang5L5 said:
Time to pull the ECU out and see what's going on.

I definitely will after work tomorrow. I just bought a MegaSquirt ECU , I have feeling I'm going to have to ask a lot of questions to get it to work.

jclose11 · Aug 14, 2019

I need schooled on this ECU what is it. . I just pulled the kick plate and saw this ECU.

Mustang5L5 · Aug 14, 2019

Looks like you already have an aftermarket Ecu

SpeedBrain Computer Chip - 5.0 Mustang & Super Fords Magazine

The SpeedBrain, developed by Automotive Computer Corporation, allows various types of engine management that you can do yourself, read more at 5.0 Mustang & Super Fords Magazine.

www.mustangandfords.com

Blown88GT · Aug 14, 2019

I never heard of that ECU. Looks like they are out of business (domain name is for sale).
If you don't have the tuning software for it, good reason to swap ECU's.
Found some info here: https://forums.corral.net/forums/94-95-tech/1128765-speed-brain-pcm.html
Go to our Digital Self Tuning sub-forum & ask Steve (Mod & Megasquirt guru)

Digital Self-tuning Forum

This forum is for those members building or tuning their own vehicles. What you will NOT find in this forum is information concerning hand-held tuners containing off-the-shelf or "canned tunes".

www.stangnet.com

vristang · Aug 15, 2019

Any chance you would be willing to post some pics of the internals of that ecu, when you get around to installing the MS?

Blown88GT · Aug 15, 2019

OP installed it today.

New to Ms2 . SpeedBrain Gone.

Well my last post was I found out my new project had a speedbrain ecu and car was running badly, So I have a MS2 I was planning to install this winter in the car, but that day came early. Today Was the day, I've been watching videos and reading on here. I think I have the settings set right, I...

www.stangnet.com

jclose11 · Aug 16, 2019

vristang said:
Any chance you would be willing to post some pics of the internals of that ecu, when you get around to installing the MS?

Sure I can have some up by monday.

Wiring Harness difference 93-94.

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That is…until I whipped out my Bissell

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mazing how much gas smell came from that tiny hole

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SpeedBrain Computer Chip - 5.0 Mustang & Super Fords Magazine

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New to Ms2 . SpeedBrain Gone.

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Wiring Harness difference 93-94.

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