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How-to

1985 Ford Bronco EFI Swap: Parts and Installed Layout

1985 Ford Bronco · Swap · Expert

Documented by SuperMotors from Phillip Hemphill’s photos

The owner, Phillip Hemphill, converted a carbureted 1985 Ford Bronco to fuel injection with parts from a donor truck. The photos show the parts gathered (manifolds, injectors, harness, distributor, computer, fuel pump), where the computer, vacuum box, relays and O2 sensor ended up, and the custom Y-pipe. They do not cover the removal of the carburetor or the full wiring and fuel procedure.

  1. Step 1

    Gather the EFI parts from the donor truck. Collect the upper and lower intake manifolds, injectors, fuel rails and injector wiring, along with the wiring harness, distributor and air box.

    Upper and Lower intake manifolds, Injectors, fuel rails and Injector wiring (1985 Ford Bronco) Wiring harness, Distributor, air box etc. (1985 Ford Bronco)

  2. Step 2

    Remove the two firewall connectors that carry the EFI wiring through to the cab. Phillip Hemphill notes that the round connector goes to the fuse panel on the inside and the rectangular one goes to the EFI computer in the driver-side kick panel.

    Close up of connectors needed to be removed on fire wall. Round - Connects to the fuse panel on the inside Rectangular - Connects to the EF… (1985 Ford Bronco)

  3. Step 3

    Pull the distributor from the donor truck with the rest of the EFI hardware. Phillip Hemphill also photographed a part marked Heavy Duty, which the donor truck's owner let him take.

    Close up of Distributor (1985 Ford Bronco) Not sure what this is, but it said Heavy Duty and he said I could take it.:) (1985 Ford Bronco)

  4. Step 4

    Take the computer along with its mounting bracket for the driver-side kick panel. Phillip Hemphill reports the donor truck had a C6 transmission, so the computer should work without problems.

    Computer and mounting bracket for inside driverside kick panel. I got lucky and the Tranny in this truck was a C6 so I shouldnt' have any p… (1985 Ford Bronco)

  5. Step 5

    Source an '86 EFI in-tank fuel pump to feed the injectors.

    '86 EFI in tank pump (1985 Ford Bronco)

  6. Step 6

    Fit the O2 sensor in the exhaust. Phillip Hemphill reports that Mike placed it where it stays easy to reach if it ever fails.

    Here's is Where Mike put my O2 sensor. Nice and easy to get to if it goes out. (1985 Ford Bronco)

  7. Step 7

    Mount the computer inside the factory tool box that was an option on early 80s Broncos.

    Located the computer in side the factory Tool box that came with the early 80s broncos as an option. (1985 Ford Bronco)

  8. Step 8

    Check the completed EFI installation in the engine bay. Phillip Hemphill notes it looks messier than the carburetor setup it replaced.

    Full shop of the EFI installed. It's a little messier then the Carb set up I had. But I think I'll deal with it. (1985 Ford Bronco)

  9. Step 9

    Mount the vacuum box on the left side of the engine compartment, and the relays, ignition module and computer box on the right side.

    Left side of the engine compartment. Mike Located the Vacuum box over there. (1985 Ford Bronco) Right side of the engine compartment. Located here are the relays, ignition module and computer. (1985 Ford Bronco) Close up of the modules and computer box.. (1985 Ford Bronco)

  10. Step 10

    Have a Y-pipe made to match the exhaust. Phillip Hemphill had one built because a '93 exhaust manifold was swapped in.

    Y-pipe I had to have made, because I swapped in a '93 Exhaust manifold. (1985 Ford Bronco)

  11. Step 11

    Identify the right fuel pump by comparing the F250 pump (white) with the Bronco pump (tan). The album's photos end here, so the fuel pump swap itself is not shown.

    F250 pump(White) next to a Bronco pump(tan). (1985 Ford Bronco)

Some product links go to the supplier the owner bought from. SuperMotors does not earn a commission today; if that changes, this line will say so and creators will be paid from it.