efi conversion

hello all.
has anyone ever done an efi conversion in an early model stang. i am currently doing a conversion in my 67 fastback and i am using the main wire harness and injector harness from a 93 5.0. my question is concerning the source (power) to the computer. does anyone know how to wire up the power to the ecu using a stock harness. i'm lost!

You can print out a installation manual from Painless wiring #60510. Its pretty easy to follow, they use the same color coded wires as the factory harness. Then you will also need to print out a manual for a Ford universal harness to show which wires on the ignition switch you will need to use.

http://www.painlessperformance.com/M...0518Manual.pdf

I did one years ago ona '68 Cougar but IIRC you'll need constant power to the EEC power relay and the fuel pump relay these are supplied from the battery side of the starter relay using a fusible link on the '93.

The EEC relay is what powers up the EFI and all you need to do is take a wire off the "run" post of the ignition switch to the EEC relay. The wire should be Red/Light Green stripe off the relay.

Word of experience. Make sure you ground the EEC harness well. The loom should have a big ground lug. We screwed it to the firewall and screwed a ground strap from there to the motor to give the EEC and the motor the same ground potential.

Also if your car is running a 1G ( original) alternator you may want to up grade or at least have that one tested. EFI likes the juice.

Good luck. PM me if you want for any questions. BTW Welcome to the board. You may want to put your location in your profile as you may have some fellow FM'rs near you!

This should get you going.

thanks guys, i really appreciate all of the info. once i get back to work on the project i will keep everyone up to date with my progress.
thanks again.

If you are looking for a plug-n-play efi system check this out:
Retrotek - Retrotek Speed Products