Need to know what ecu to use - Ford Mustang Forum
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post #1 of 19 (permalink) Old 01-24-2013 Thread Starter
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Need to know what ecu to use

I have a complete 5.0 with gt40 heads, intake, and cam. What years were they produced and what is the correct ecu for this motor? I'm installing into a project of mine. I want to go with everything "factory" on the motor first and get it running properly before I do any mods. I believe the motor came out of 92 or 93 mustang.
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post #2 of 19 (permalink) Old 01-24-2013
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The ECU for the manual Mustangs were called the A9L. The A9P was used in the automatics. From what I understand, either will work, they are just tuned slightly differently. However, it is best to stick with the appropriate ECU for your application.

Quick edit: those computers are all used on Mustangs from 1989-1993, if I'm not mistaken. They are all the same.

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post #3 of 19 (permalink) Old 01-24-2013 Thread Starter
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Quote:
Originally Posted by PhReaK View Post
The ECU for the manual Mustangs were called the A9L. The A9P was used in the automatics. From what I understand, either will work, they are just tuned slightly differently. However, it is best to stick with the appropriate ECU for your application.

Quick edit: those computers are all used on Mustangs from 1989-1993, if I'm not mistaken. They are all the same.
I plan on using a aod so the a9p would be what I want? There is the possibility this motor came out of 93 cobra and I've found where they have a completely different computer. How can I tell on my motor what year car it came from
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post #4 of 19 (permalink) Old 01-24-2013
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If it's from a Cobra it will have 24 lb/hr injectors (blue top), GT40 heads (see here for ID info), and a GT40/Cobra intake (see picture I attached here, the GT40 is the one with round and offset ports).

If the engine came with an automatic attached to it it's almost definitely not a Cobra engine. Cobras were never available with an auto.
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post #5 of 19 (permalink) Old 01-24-2013
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The 1993 cobra only came manual tranny.

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post #6 of 19 (permalink) Old 01-24-2013 Thread Starter
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Quote:
Originally Posted by PhReaK View Post
The ECU for the manual Mustangs were called the A9L. The A9P was used in the automatics. From what I understand, either will work, they are just tuned slightly differently. However, it is best to stick with the appropriate ECU for your application.

Quick edit: those computers are all used on Mustangs from 1989-1993, if I'm not mistaken. They are all the same.
Quote:
Originally Posted by Smurf stang View Post
The 1993 cobra only came manual <acronym title="transmission">tranny</acronym>.
All I have is the motor. No tranny. Plan on putting an automatic on it. Like I said before I'm not sure what year the motor came from. I got it from a guy who came through my shop and he said he wasn't sure but thought it may have came from a 93 cobra. So my question is if it is the cobra motor what ecu you will work with the auto? A9p? And if it is a cobra motor will the a9p work without having to change pins around like I've seen a few people talking about on here
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post #7 of 19 (permalink) Old 01-24-2013
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OP read what Pete said to see if it is a Cobra motor.

What harness are you going to use?

Next, you can use the A9P with the motor and the appropriate MAF.

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1989 Sonic Blue Mustang LX Coupe, 349 ci,
392 rwhp 424 rwtq....Mustang Dyno
"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -Will Rogers-
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post #8 of 19 (permalink) Old 01-24-2013
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I think the part numbers for those heads in that article are wrong.The heads for the cobra's should be F3ZE or F4ZE and so forth.They have the part number as an E3ZE which would be for an 1983 head. E=1980's and F=1990's.If someone else can chime in let me know if I'm smokin or not.Thanks.
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post #9 of 19 (permalink) Old 01-24-2013
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Quote:
Originally Posted by sm88stang View Post
I think the part numbers for those heads in that article are wrong.The heads for the cobra's should be F3ZE or F4ZE and so forth.They have the part number as an E3ZE which would be for an 1983 head. E=1980's and F=1990's.If someone else can chime in let me know if I'm smokin or not.Thanks.
Well, this is a rather embarrassing moment...

I'll see that gets taken care of. Thank you.

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post #10 of 19 (permalink) Old 01-24-2013 Thread Starter
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Quote:
Originally Posted by Smurf stang View Post
OP read what Pete said to see if it is a Cobra motor.

What harness are you going to use?

Next, you can use the A9P with the motor and the appropriate MAF.
I wasn't sure what harness I was going to use yet because I'm pretty sure some off the harnesses are ecu specific as well. If the a9p will work I've got a harness for that ecu. Just need to find the ecu now.
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The 93 cobra and the MAF Fox mustangs used the exact same harness (comparing manual to manual anyway...)
I swapped a 93 cobra ecu into my 90GT. It's a direct swap, if it's a manual.
There is a minor difference on the auto harness, but I never focused enough on it to fully comprehend... something in the o2 harness.

If you have the blue 24lb injectors, I would say go with a 93 cobra ecu and MAF setup. If you don't have 24's, then I would use the standard 5.0HO ecu (A9L, A9P, A3m, etc...)


The Ford codes (E3ZE, etc) are not production year codes. They break down into the year of design and model that they were originally designed for. It is not uncommon for a part to have been engineered for one model, then used for several years on several other models...

jason (aka - vristang)
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post #12 of 19 (permalink) Old 01-24-2013 Thread Starter
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Quote:
Originally Posted by dudeboy View Post
The 93 cobra and the MAF Fox mustangs used the exact same harness (comparing manual to manual anyway...)
I swapped a 93 cobra ecu into my 90GT. It's a direct swap, if it's a manual.
There is a minor difference on the auto harness, but I never focused enough on it to fully comprehend... something in the o2 harness.

If you have the blue 24lb injectors, I would say go with a 93 cobra ecu and MAF setup. If you don't have 24's, then I would use the standard 5.0HO ecu (A9L, A9P, A3m, etc...)


The Ford codes (E3ZE, etc) are not production year codes. They break down into the year of design and model that they were originally designed for. It is not uncommon for a part to have been engineered for one model, then used for several years on several other models...
The guy I got the motor from put 30lb injectors on it for whatever reason. Any other tell tale signs of a cobra motor?
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post #13 of 19 (permalink) Old 01-24-2013 Thread Starter
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Also he said that heads had XXX stamped into the side indicating a cobra?
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The cobra motor came with 24 lb'ers and the XXX stamp on the block means it is a roller block.

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1989 Sonic Blue Mustang LX Coupe, 349 ci,
392 rwhp 424 rwtq....Mustang Dyno
"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -Will Rogers-
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Quote:
Originally Posted by Bassmaster229 View Post
Any other tell tale signs of a cobra motor?
I love when people appreciate my effort to share knowledge.

.... Did you see my original post :?:

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