Hi all, I have just about totally completed my 302 swap into my bronco II. A little back ground on what I have. I have taken a 302 out of a 1991 F150 EFI motor with the EEC-IV computer. I have transplanted everthing I could think of needing from the truck with the motor. such as the wiring harness and computer and all sensors and vaccum and ignition parts. I am completley done but I am getting no spark. There must be something I am overlooking in the wiring diagrams. I am getting codes from the computer and it is tied in to the ignition switch. fuel pump is also tied in ad turns on for a few sec when key is turned to on position. I am pretty close to giving up, I have replaced the ignition module and coil new wires spark plugs cap rotor and pickup coil. I have both a chilton and hanes manuals on both the donor F150 and for my bronco II. There are actually a few wires coming from the computer to the big round plug that is next to the computer in the fire wall that the manuals say nothing about. so I have no idea what they are for. any help with this electrical problem would be great thanks

 

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Most Ford Dealership will have the EEC IV wiring schematic for your vehicle. If you were to ask the dealership to make copies of the pages pertinent to your 1991 F150 EEC IV, they will usually understand your situation and try to help you. These wiring schematic for EEC IV are not covered on any Chilton or Haynes Manuals. They are usaully covered in the Ford Shop Manuals for the year, make and model of your vehicle you are trying to fix.

One can also purchase these Ford Dealer Shop manuals specific to your EEC IV setup.