94 351W Computer Swap
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More Turbo
Joined: Jan 2006
Posts: 615
Likes: 6
From: Tucson, AZ
94 351W Computer Swap
A little help please. I've located a 94 351W EFI to swap into my 48 F1. I'm trying to decide if I need to get the computer and wiring harness to go with it.
The motor is coming out of a conversion van and has an E4OD transmission. Because its a 94 and a van with the E4OD I can't tell if its a speed density or a MAF engine. From the VIN the dealer tells me:
engineering computer code: F4TF 12A650 MB.
Engine Code: H
Last part of the VIN: RHA9####
My question: Is this a mass air flow or a speed density computer?
I would like to use an AOD transmission instead of the E4OD.
The motor is coming out of a conversion van and has an E4OD transmission. Because its a 94 and a van with the E4OD I can't tell if its a speed density or a MAF engine. From the VIN the dealer tells me:
engineering computer code: F4TF 12A650 MB.
Engine Code: H
Last part of the VIN: RHA9####
My question: Is this a mass air flow or a speed density computer?
I would like to use an AOD transmission instead of the E4OD.
Post Fiend
Joined: Oct 2003
Posts: 6,214
Likes: 13
From: New Jersey
that part number translates to a speed density computer.
And you can use an EEC programmed for an electronic transmission with a manual, or a non-electronic transmission like your AOD. The engine light won't even light. But when you go to pull codes for troubleshooting, the EEC will give several "transmission failure" codes, as should be expected.
If you're going to run the engine as is, or make minor modifications, speed density is fine. It's when you start with some cam changes (as in overlap) where speed density EFI systems start to puke (at least Ford EEC stuff). Speed density relies on engine vaccum, so if you don't change the vaccum too much, it's fine.
And you can use an EEC programmed for an electronic transmission with a manual, or a non-electronic transmission like your AOD. The engine light won't even light. But when you go to pull codes for troubleshooting, the EEC will give several "transmission failure" codes, as should be expected.
If you're going to run the engine as is, or make minor modifications, speed density is fine. It's when you start with some cam changes (as in overlap) where speed density EFI systems start to puke (at least Ford EEC stuff). Speed density relies on engine vaccum, so if you don't change the vaccum too much, it's fine.
Lead Driver
Joined: Nov 2002
Posts: 9,556
Likes: 43
From: Concord, NC
Most likely it is speed density. If you can get your hands on the computer, it will be marked either SD-EFI or MA-SEFI on the label. I would find an AOD or C6 computer instead of one for the E4OD anyway.
Elder User
Joined: Jun 2006
Posts: 654
Likes: 0
A aftermarket computer could be quite nice as well.
Accell makes a simple to use one, or something like MegaSquirt that you program yourself would be very cheap. A basic megasquirt setup will run ya 300 or so to start, and then you just upload a 5.8l program, or customize it if you want to.
Accell makes a simple to use one, or something like MegaSquirt that you program yourself would be very cheap. A basic megasquirt setup will run ya 300 or so to start, and then you just upload a 5.8l program, or customize it if you want to.
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