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Guys the main connector that the engine wiring harness connects into before it goes intothe actual computer, how do you disconnect that plug so I can plug in another harness?
I take it you talking the plug mounted to fender well? Loosen the center bolt to remove cover and separate plug. The new engine harness will have extra wires for injectors (now sequential injection) and be missing some for the sensor that moved to air box. You will need to make sure all wire are in same spot (except the ones you have to add) on both harnesses or you will have to move them.
If its the ECU its self loosen center bolt ,remove ecu plug (this plug will not plug into New ecu Till wire are added / moved.So pins line up ) . remove the upper and lower bolt on ECU loosen fender splash pan remove ecu.