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Thread: Putting a GM TBI system on my 1972 Ford F-250

  1. #1
    Electronic Ignition!
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    Putting a GM TBI system on my 1972 Ford F-250

    I own a 1972 Ford F-250 4x4 with a 390 v8 with a 4speed trans .The 4speed will be swaped out for NV4500 5speed but that's another story. I have been looking around this site for awhile and i have decided to do a GM TBI conversion . Well I work in a wrecking yard so finding parts is a no brainer . I found a 88 Chevy truck that donated the computer an its wiring harness,sensors,distributor . Now I'm sitting here with a huge pile of wires trying to figure out what I need to keep an whats going to end up on the floor! I'm doing the build your own distributor out of a ford points distributor an a small cap GM HEI distributor as out lined here on this site. This build is going to take awhile like a year maybe cause i'm building a new motor an painting the truck plus the 5speed swap. I will take pic's as i go along here an of course asking a ton of questions cause this is my first efi conversion if this works great my 1978 bronco is next to get the GM TBI conversion


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    Fuel Injected! mmigacz's Avatar
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    Quote Originally Posted by akforceten View Post
    I own a 1972 Ford F-250 4x4 with a 390 v8 with a 4speed trans .The 4speed will be swaped out for NV4500 5speed but that's another story. I have been looking around this site for awhile and i have decided to do a GM TBI conversion . Well I work in a wrecking yard so finding parts is a no brainer . I found a 88 Chevy truck that donated the computer an its wiring harness,sensors,distributor . Now I'm sitting here with a huge pile of wires trying to figure out what I need to keep an whats going to end up on the floor! I'm doing the build your own distributor out of a ford points distributor an a small cap GM HEI distributor as out lined here on this site. This build is going to take awhile like a year maybe cause i'm building a new motor an painting the truck plus the 5speed swap. I will take pic's as i go along here an of course asking a ton of questions cause this is my first efi conversion if this works great my 1978 bronco is next to get the GM TBI conversion

    I'm curious how things go. I too am in the process of putting a TBI fuel injection system on a ford motor. My project is different:

    -I'm using a 351W
    -Its going in a boat
    -I'm using the ford duraspark distributor (with modifications)
    -I'm not using the VSS, EGR, Knock, or any other transmission related sensors.

    So far the TBI system is installed, the engine is running, and I am starting the tuning process.

    Good luck!

  3. #3
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    That sounds like a cool project you got going on. I'm still in the wiring phase like figuring out what to eliminate an what to keep and getting that glob of glue that GM used on the firewall plug.

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    EFI GearHead ! EagleMark's Avatar
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    Acetone melts that glob of glue and does not hurt the wires.

    Wiring diagrams are in the $42 info thread. Think one wire at a time. The hardest part of re-wiring a stock harness is planning how to fuse and relay what you need. I like to add a realy to turn it all on! Then you can use the wire that went to points to turn that relay and system on.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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    Thank you EagleMark for the info. i have been using the wiring diagrams on this site but it still make my head hurt sometimes lol . There good diagrams have been helpful for me. I'm eliminating EGR stuff,auto trans w/VSS wiring,knock sensor so far.I tell you when you get the stock harness unwrapped what a mess of wires!

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    EFI GearHead ! EagleMark's Avatar
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    Yup yup yup! It's not the type of thing for a guy who's strapped for time or has no patience!

    Solder and shrink wrap! Take your time! One wire at a time!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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    I agree its a very slow process and yes I will be soldering an shrink wrapping .This is a learning experience for me.Oh by the way I thank you for such a wonderful site!

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    When i pulled this harness from the truck there are i plugs that go to the computer then about a foot down is 2 black plugs that go on to a clear double plug .coming out of this plug is a purple wire that is spliced to a purple/white wire and a resister with 2 purple wires on the other side . i cant seem to find this in any wiring diagram oh yea there is a black plug with another resister in it what is this?

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    EFI GearHead ! EagleMark's Avatar
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    If it does not come from or go to ECM, then it's not something EFI related...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  10. #10
    Electronic Ignition!
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    Thank you an no it doesnt goto or come from the ECM so it goes on the chopping block.

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    Fuel Injected! mmigacz's Avatar
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    Quote Originally Posted by akforceten View Post
    When i pulled this harness from the truck there are i plugs that go to the computer then about a foot down is 2 black plugs that go on to a clear double plug .coming out of this plug is a purple wire that is spliced to a purple/white wire and a resister with 2 purple wires on the other side . i cant seem to find this in any wiring diagram oh yea there is a black plug with another resister in it what is this?

    I know there is a purple and white wire that goes from the ECM (pin C9) to the starter solenoid. I'm not quite sure if it does anything, maybe it lets the ECM know when the starter is cranking.

  12. #12
    EFI GearHead ! EagleMark's Avatar
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    Yup! Handles Cold Start Crank Fueling.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  13. #13
    Electronic Ignition!
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    so how is this going???

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    well the engine is getting ready to go back to the machine shop for balancing then i get to assemble it an put it in the truck

  15. #15
    Electronic Ignition!
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    Sorry for the long wait to update but i have 2 fords that i'm going to do this EFI thing to.so after a ton of research i went to work an got a engine wiring harness out of a 1990 suburban computer 7747. I'm amazed at how simple it was to prep well here's some pics







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