I have a 93 ford ranger 4x4 with a 3.0 ltr engine. I would like to know what i need to unplug to time the engine, and what the timing needs to be set at.

On my '99 4.0L, the timing and the idle speed are not adjustable. The computer takes care of that however, I don't know about your year truck.

Disconnect the single wire in-line SPOUT connector which connects the control computer (usually terminal 36) to the ignition control module. This will prevent the electronic ignition from advancing the timing during the set procedure.

Timing Specification 10 Degrees