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  1. #1

    Default Anyone swapped in a 86-88 efi harness into a early 80's Mustang?

    I have done a 5.0L swap into a 81 Mustang that was a 200 6 cyl automatic. I know the harness is mostly stand alone but the grey 8 pin and black 8 pin by the brake booster and the green 8 pin by the pcm I need to figure out what the wires got to. Any help would be appreciated.

  2. #2
    FEP Super Member xctasy's Avatar
    Join Date
    Jun 2012
    Dunedin 9011, New Zealand, South Pacific


    See Dean T and V8only. An 86 swap to an 84 car. That might help.

    See ""

  3. #3


    If it makes a difference, I found when I swapped a '90 harness into a '79, most wire colors were the same for the same things between them.

    Sent from my SM-S901U using Tapatalk

    '79 Mercury Zephyr ES 5.0L GT40 EFI, T-5
    '17 Ford Focus ST
    '14 Ford Fusion SE Manual

  4. #4


    Get yourself an EVTM for your car. Like THIS

    That will help identify what those connectors/wires are for.
    83 TC "Clone"
    85 Marquis LTS

  5. #5
    FEP Senior Member OX1's Avatar
    Join Date
    Feb 2009
    Jackson, NJ 08527


    Agree, huge help. Most of those wires in the black/white connectors go back to the EEC.

    Found this just now.

    Last edited by OX1; 05-24-2023 at 04:43 PM.
    86 Capri, 5.0, 5Spd, A9L QH/BE, 47 lb Inj PMAS 3" MAF, Single T44 Turbo, Front Mount IC, TW170,
    Stock Cam, Explr Intake/TB, 1.7 Rockers, CF dual friction clutch, 3" DP, 2.5" full Exh, 3.27, 11.932 @ 115.78
    84 LTD, 331-10:1, TW170/Exprl Intake, 47 lbs inj/80 mm LMAF, Full Duals, Quarterhorse, Vortech 7PSI, Lentech AOD, 5 lug Mk VII brakes/rear, Eibach Sway bars, Cobra HB (dads ride, but I fix it )

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