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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 07-12-2014, 09:27 PM   #1
fordguy52
 
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Default REPLACEMENT ECM

Hi all,
I need to replace the ECM in a 1989 LX, Blue Print 331 stroker motor, AOD, Trick Flow intake, CAI, 28# injectors, etc...

Old ECM P/N E9ZF-12A650-C2A

I can not find an ECM with this part number. Are other ECM's compatible?

It is definitely bad there was charring around 2 capacitors on the board.
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Old 07-12-2014, 09:38 PM   #2
mjr46
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look for an a9p ecm iirc
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Old 07-12-2014, 10:18 PM   #3
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Thank you sir! Figured as much, just wanted a little backup>
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Old 07-12-2014, 11:09 PM   #4
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Just to throw it out there, with your engine combo an upgrade wouldn't hurt... I haven't read up on them much but the MegaSquirt PNP looks like a decent little ECM for the money.
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Old 07-13-2014, 08:05 AM   #5
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Default Looks great! Thanks much!

I have never seen a programmable ECM for a fox body before! We will definitely check into this. Do you have actuall experience with Megasquirt?
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Just to throw it out there, with your engine combo an upgrade wouldn't hurt... I haven't read up on them much but the MegaSquirt PNP looks like a decent little ECM for the money.
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Old 07-13-2014, 11:16 AM   #6
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I've met owners and seen their cars running on MegaSquirt, but never a PnP. That's the limit of my experience (which is to say I have virtually none). MegaSquirt in general has been around for quite awhile and are pretty well known though. They started out as basically the "heathkit" of ECMs (build it yourself from plans) and you still can. Then they grew into what they are today.

A google of "MegaSquirt" should keep you busy reading for about 2 months. The PnP should be mostly the same idea, just literally dirt simple to install.

Good luck! If you do go that route I don't think I'd be alone in wanting to hear about your results! I'm very curious about how good/bad the launch control and traction control are.
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Old 07-14-2014, 10:08 AM   #7
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I bought my reman'd A9P from Autozone for $100, and it was in stock.

And nothing against Megasquirt, or any other tuner. But the stock ECM is quite capable. With my mods, the stock ECM kept air/fuel ratio right on the money with stock driveability.
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Old 07-14-2014, 10:44 AM   #8
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I was just throwing it out there. My long game includes boost so that's my personal interest in one plus the other features.

I didn't intend for it to at all sound like a requirement.
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Old 07-15-2014, 08:07 AM   #9
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Quote:
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I was just throwing it out there. My long game includes boost so that's my personal interest in one plus the other features.

I didn't intend for it to at all sound like a requirement.
Requirement ……no, but your right in that its a fun tool to play with. I have an Anderson PMS in my car that I picked up cheap. No, I don't need it, but with a wideband O2 and the tuner, it is nice to know exactly what's going on. If I want to add/subtract fuel or timing, it's just a couple button clicks and done.

They are nice to have, but on a bolt on NA car, the stock computer will do fine.
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Old 07-15-2014, 08:15 AM   #10
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Thanks guys for the response's. We really didn't want to spend the extra cash for the Megasquirt right now. It's good to know the Stock ECM can handle it.

I'm sure once this beast is running and we get used to it we will start looking for more power.
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Old 07-15-2014, 08:15 AM
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