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  1. #1
    FEP Member LSCR351's Avatar
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    Default 86 efi swap, am I going to have to pull the dash?

    I will be swapping an 86 EFI harness into my 86 4cyl Coupe, and it just hit me, Am I going to have to pull the dash? I know on the 87-93 cars it is not nessesary, but what about a 1986?
    69 Mustang Fastback= EXPENSIVE
    84 SVO= project pick up the front wheels
    86 Coupe= project show car
    87 Mark-VII Vortech'd351/T56= TROUBLE
    93 Town&Country= DD/work van
    96 F150 Lightning FlareSide= boat hauler
    99 P71 the "PO-RAUDER"=weekend ride (awaiting built motor)
    00 Excursion 7.3PSD= long distance trips
    05 F250 V10 SCSB= the Hot-Rod pick-up, trailer puller
    Wifes rides: 97 Exploraineer Sport V8= DD, 93 GT 2.3t/T5= backup, 05 F250 SCSB 4X4= toy

  2. #2
    FEP Power Member kj_80Cobra's Avatar
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    Default

    I believe the '86 EFI harness will plug into the '86 dash harness so no need to pull the dash. You will need to run the fuel pump wiring from the connection located in the driver's side kick panel.

  3. #3
    FEP Member LSCR351's Avatar
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    Default

    OK, thank you. And I do have the tail-light/fuel-pump harness too.
    69 Mustang Fastback= EXPENSIVE
    84 SVO= project pick up the front wheels
    86 Coupe= project show car
    87 Mark-VII Vortech'd351/T56= TROUBLE
    93 Town&Country= DD/work van
    96 F150 Lightning FlareSide= boat hauler
    99 P71 the "PO-RAUDER"=weekend ride (awaiting built motor)
    00 Excursion 7.3PSD= long distance trips
    05 F250 V10 SCSB= the Hot-Rod pick-up, trailer puller
    Wifes rides: 97 Exploraineer Sport V8= DD, 93 GT 2.3t/T5= backup, 05 F250 SCSB 4X4= toy

  4. #4
    FEP Power Member Ourobos's Avatar
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    Default

    ^ Correct info. But the 87-93 don't require you to pull the dash, only swap the ECU harness also.
    1986 CHP SSP Coupe

  5. #5
    FEP Member LSCR351's Avatar
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    Default

    I know they don't, that's what i stated in post one.
    69 Mustang Fastback= EXPENSIVE
    84 SVO= project pick up the front wheels
    86 Coupe= project show car
    87 Mark-VII Vortech'd351/T56= TROUBLE
    93 Town&Country= DD/work van
    96 F150 Lightning FlareSide= boat hauler
    99 P71 the "PO-RAUDER"=weekend ride (awaiting built motor)
    00 Excursion 7.3PSD= long distance trips
    05 F250 V10 SCSB= the Hot-Rod pick-up, trailer puller
    Wifes rides: 97 Exploraineer Sport V8= DD, 93 GT 2.3t/T5= backup, 05 F250 SCSB 4X4= toy

  6. #6
    FEP Power Member Syco Stang's Avatar
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    Feb 2007
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    Toronto, ON
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    Default

    It should be plug and play. I've done the swap in a V6 '85 Mustang to an '86 5.0 EFI setup and it was the easiest part of the swap. Shouldn't have to pull the dash.
    I would run an upgraded and relayed connection for the fuel pump using at least 10 gauge wiring. Make sure you wire in the rear impact fuel shutoff switch. The stock fuel pump wiring is barely adequate for the stock pump, and will choke any upgraded pump. It's easy and inexpensive to do.
    1986 GT T-Top 5.0, waiting on trans and IRS swap.
    1988 GT Ragtop, 5.0, T5, 3.73, 03 Cobras with Nittos
    1989 LX Ragtop, 5.0, AOD, shift kit, Pony wheels, baby cam, X pipe and Flowbasterds.
    1984 SVO needs TLC

  7. #7

    Default

    Maybe I should have asked this question before I pulled my dash. LOL
    But experience is half the battle I guess.
    four 5 Customs - Custom Upholstery StL

    85 Hatch 5oh EFI transplant
    93 LX Vert.... Deceased

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