EEC-IV SFI-MA12A

amps1956 · May 6, 2025

OK completely new to this old computer I acquired a 1973 cougar with a home made fuel injection system on it and I know nothing about it but this is running it or was . its got a built 351 C Weiand manifold with bungs welded in for injectors a plemin from a truck (Snorkel) 2 giant throttle bodies and a big mass air flow. I had it running and driving went to move now no fuel pump or ignition I can jump pump so its good but have no clue what happened . any help will be greatly appreciated or even what and how to up grade that's budget friendly as I am retired. even if I went back to a carb

this this was built as a drag car I am using as street rod forgot to mention its got a fogger on it but its not being used , narrowed 9 inch ,3 link hi flow fuel pump, roll bar and more !

thanks in advance

Noobz347 · May 6, 2025

Holy xero information Batman.

In reference to what is in there now: Is it multi-port, CFI? What is controlling it? There's a "Box" somewhere, with a bunch of wires coming out of it, what's written on it?

I doubt that it is truly a "homebrew" setup. That's not something you can just throw together from an old Speak-N-Spell. Figure out what's in there and we might be able to find a manual on-line someplace.

Noobz347 · May 6, 2025

Does your ECU say, "A9L" on it anywhere?

amps1956 · May 7, 2025

here is a start on pictures and yes its definitely a home made system as I can load them

amps1956 · May 7, 2025

Here is some of motor if you need anything closer I can get them it's just outside

Mcmahst · May 7, 2025

That looks like a 315W out of an F150 or Bronco. And it doesn’t look homemade, but a newer vehicle donor in a later model car. I could be wrong. There are some very smart folks on this site (not me).

amps1956 · May 7, 2025

its not a 351w according to the timing chain and what I have read

Noobz347 · May 7, 2025

What you have in an A9P EEC-IV from an 89+ Mustang with a 302 and automatic.

This EEC is [not] going to work for your 351 without chip-tuning.

amps1956 · May 7, 2025

This is close up

amps1956 · May 7, 2025

This is a 351 m as was mentioned above not the same

Noobz347 · May 7, 2025

I'm moving this to [Other Auto Tech} as it is not a digital tuning issue and not a Mustang.

amps1956 · May 7, 2025

Noobz347 said:
What you have in an A9P EEC-IV from an 89+ Mustang with a 302 and automatic.

This EEC is [not] going to work for your 351 without chip-tuning.

I am sure it was tuned it was running fine then we went to move it and now nothing no fuel or fire like a blown fuse or something not sure were the power comes from if I new what powered computer I can trace it back . it will turn over and I can make fuel pump run

amps1956 · May 7, 2025

Noobz347 said:
I'm moving this to [Other Auto Tech} as it is not a digital tuning issue and not a Mustang.

ok I am just looking for help did not know where or even how to post but its mustang parts

Noobz347 · May 7, 2025

You should probably start with the basics.

Do you have and know where the diagnostic connector is? Even in that car, it should be on the driver side, near the firewall.

Here are a list of list of steps for pulling codes from a Mustang:

Electrical Thread 'How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs'

Jan 27, 2016

@Noobz347 - The code dump procedure isn't in the sticky - you may want to add it...

Dump the codes: Codes may be present even if the Check Engine Light (CEL) isn't on.

Dumping the computer diagnostic codes on 86-95 Mustangs

Revised 26-July-2011. Added need to make sure the clutch is pressed when dumping codes.

Codes may be present even if the check engine light hasn’t come on, so be sure to check for them.

Here's the way to dump the computer codes with only a jumper wire or paper clip and the check engine light, or test light or voltmeter. I’ve used it for...

Noobz347 · May 7, 2025

Also:

If your A9P were in fact, tuned... It would have a big chip sticking out of the back. They are not themselves, programmable.

amps1956 · May 7, 2025

Noobz347 said:
Also:

If your A9P were in fact, tuned... It would have a big chip sticking out of the back. They are not themselves, programmable.

ok where do I look for this ? its mounted in SAME PLACE AS STOCK

Noobz347 · May 7, 2025

The chip connector is in the back.

The slot come from the factory covered with foil.

amps1956 · May 7, 2025

Well I will get my son to pull it out and check it !! Should I keep this set up or go to something newer??

General karthief · May 7, 2025

I'll give you my 'old man' advice, if your gonna keep this junk then start with the wiring, bare wire stuck into a spade connector is not a dependable attempt at a repair, make sure all the grounds for the stock computer wiring is attached good and not stacked all in one spot, typical DYI mistake, don't add any extra grounds either.
Me, being hard headed, would jump right to changing the TFI module.
Also I would send that computer off to the ECUExchange for a 'tune up', they are 30+ years old and don't perform as they should anymore, like people getting old, takes me all day to do what I used to do all day
That link will help you ID and diagnose your issue.
Keep us posted.

amps1956 · May 8, 2025

General karthief said:
I'll give you my 'old man' advice, if your gonna keep this junk then start with the wiring, bare wire stuck into a spade connector is not a dependable attempt at a repair, make sure all the grounds for the stock computer wiring is attached good and not stacked all in one spot, typical DYI mistake, don't add any extra grounds either.
Me, being hard headed, would jump right to changing the TFI module.
Also I would send that computer off to the ECUExchange for a 'tune up', they are 30+ years old and don't perform as they should anymore, like people getting old, takes me all day to do what I used to do all day
That link will help you ID and diagnose your issue.
Keep us posted.

A lot of the wiring goes to nothing I am finding out and I would just as soon junk all that crap and go back to a carb but not sure how or what size as I don't even know what they did to the motor this thing was built almost 20 years ago sat in a storage or something till it was bought at auction by the people I got it from I am now just trying to see why it stopped running out of the blue

EEC-IV SFI-MA12A

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Electrical Thread 'How To Pull Codes From EEC-IV In 86- 95 5.0 Mustangs'

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wonder how much it would cost to ship you a pair

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