Going back to EFI

thestig

New Member
May 16, 2011
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Hey everyone, new member here.

I just got a 1988 fox that needs some work and one thing I want to do is lose the carb a PO put on the car. What all is required to go back to EFI?
 
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Is it an oroginal 5.0 efi car?

Most 87-93 carb swaps start life as a 2.3L mustang. Most just figure a carb is easier than changing out wiring and such.

First step is to identify what the po removed. The obvious things are the upper intake, injectors, 87-89 engine harness, and deciding on mass air or speed density. But its hard to lost other items without knowing what fuel pump is in the tank, or what fuel lines were used.

Some guys do hack conversions to carb, and some do excellent jobs. Until will know what your car is, hard to list everything really.
 
Is it an oroginal 5.0 efi car?

Most 87-93 carb swaps start life as a 2.3L mustang. Most just figure a carb is easier than changing out wiring and such.

First step is to identify what the po removed. The obvious things are the upper intake, injectors, 87-89 engine harness, and deciding on mass air or speed density. But its hard to lost other items without knowing what fuel pump is in the tank, or what fuel lines were used.

Some guys do hack conversions to carb, and some do excellent jobs. Until will know what your car is, hard to list everything really.

Sorry, really should have been more specific. Yes, it was a 2.3L.
 
Gas tank with in tank pump, hard fuel lines going from tank to engine bay. Upper and lower intake, fuel rails, fuel injectors, various sensors used for efi, computer harness, computer, coil and efi distributor... I'm sure I'm missing some stuff but that's what I can recall off the top of my head
 
Gas tank with in tank pump, hard fuel lines going from tank to engine bay. Upper and lower intake, fuel rails, fuel injectors, various sensors used for efi, computer harness, computer, coil and efi distributor... I'm sure I'm missing some stuff but that's what I can recall off the top of my head

An entire new gas tank? Wow

FML this blows
 
An entire new gas tank? Wow

FML this blows

Not necessarily. Goes back to how WELL of a job the OP did converting the car to carb.

It should have been changed to a low pressure fuel pump, but who knows. I've seen plenty of jobs done with the EFI high pressure pump is left in place and a special regulator is used to drop the pressure down.

So what it takes really depends on what is done.


It's like any of the other swaps...

AOD to T5
EFI to Carb
2.3L to 5.0


There is the right way to do it...and the shortcut methods
 
Ya you won't need a new gas tank depending on how it was converted.. if it was done the right way though than you will. Even if you need a new gas tank, the 4 cylinder efi ones use the same as the 5.0 so they should be easy to find one.
 
Keep in mine, the only engine harness that will made up to an 87-89 body harness is the 87-89 harnesses. SO if you find a MAF harness, it NEEDS to be a 1989 MAF harness (or 88 cali) otherwise it won't mate up to the internal body harness and you'll need to swap that.

2.3L and 5.0 body harnesses are the same.
 
Just out of curiosity, what's your issue with the carb?

According to everybody I ask, the carb won't pass inspection. Plus I just want some of the advantages of it

Keep in mine, the only engine harness that will made up to an 87-89 body harness is the 87-89 harnesses. SO if you find a MAF harness, it NEEDS to be a 1989 MAF harness (or 88 cali) otherwise it won't mate up to the internal body harness and you'll need to swap that.

2.3L and 5.0 body harnesses are the same.

Whew. Looked and it's off an 89. Thanks for all your help