I have a carbureted 302 HO engine in the daily driver, I just bought a wrecked 92 mustang with a fuel injected HO 302 and a 5 speed my car already has a five speed but I would like to swap out the fuel inj. motor with carb motor and leave all the fuel injection in tact so I could get better mileage plus the fuel injected motor has been rebuilt with a few goody's in it. Anyone know how to find out what wires that go into the car I will need to keep when I retro fit the car? I know all the wires pertaining to the computer will need to be taken out all together and put in the daily driver. I'm just not sure what all I will need that goes in through the fire wall on the other side where the steering coulumn comes into play with the ignition switch. Oh yea it has multi port fuel injection. Anyone on here done any of this before?
Not trying to snub you, but it might be better to try this question on www.corral.net or some other late-model Mustang net. From what I understand, there aren't a lot of wires actually needed & you could probably figure it out with a good service manual...
dude, go here... http://www.broncofix.com/Tech/efi/Ford%20Multiport%20EFI%20Wiring%20Manual.htm and look at the tech page on the main site... http://www.broncofix.com/Tech/tech.htm
Ford Racing sells a harness for exactly this adaptation. I am sure they are proud of their work ($$), but depending on how skilled you are, it might be worth considering. Painless also has a kit, as well as a good reputation. Keep in mind that the wiring is only part of the adaptation for this setup. It will need a high-pressure fuel system, with a return line for the fuel regulator, as well......
You really don't need the Ford Racing/SVO/Motorsports big-bux harness - it already exists in your donor vehicle. The trick is weeding out the crap. Seriously, you should be able to figure it out with a decent schematic from a good service manual. There really aren't that many "external" inputs - it should be basically a 3-wire hookup - the harnesses should be mostly self-contained... Hell, it may not even be that difficult - just unwrap the tape from the harness & sort through it - sounds daunting, but the harnesses unplug into sub-harnesses. Your engine/sensor/computer group should be pretty easy to figure out.
I was planning on just using everything out of the donor car. Because I can make it fit my other car.
I have been looking in to this topic because I am using the FI stuff from an '88 Town Car (actually the whole dang chassis) and need to see what I need and what I don't for the wiring of the '51 Merc. The info in these links is for is specific to certain applications, but generic as far as adapting a non-FI engine to an older chassis... http://www.ford-trucks.com/articles/5liter.php And this one: http://fordfuelinjection.com/index.htm Or this: early ('64) Mustang to modern EFI: http://www.mustangsplus.com/tech/efi/ good luck!
Thanks for the information this doesn't look very hard at all other than just pulling the stuff apart. I know the EFI cars that I have driven have soooo much better throttle response compared to the carb versions like I have now. I would do a tech post on it when I do the switch but my daily driver is a bit later model then most people would probably want to see a tech post on. even though this would work on an old car to.
As Animal pointed out, you'll also need to modify your fuel system. You'll need a high-pressure pump & feed line as well as a return line. There's a company that sells an adapter to go into the Ford fuel rails using the push-spring fitting, but allows the use of AN-style hose - check out a SuperFord magazine or Muscle Mustangs or something like that - should be in the back. This will make it easier to adapt. As for the pump, you can modify your tank to take an in-tank pump, but there are several external pumps available. I think in-tank pumps may be preferable, but it'll prolly depend more on your setup than anything else... Be sure & use the distributor out of the donor car too - it has the TFI module that feeds into the computer. Another consideration is you prolly really want a mass air system & not a speed density. While the Ford speed density system is good, it's not very forgiving of engine mods. There are conversion kits out there to make the swap, but if your donor is after '89 or so, I think it's mass air from the factory (not sure though). You can certainly get the engine running with speed density - depending on the state of tune. Finally, if you do get it up & running on mass air & make major mods, a lot of the Mustang dyno-tuner crowd can really dial in your chip for you. Good Luck!
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