Quote:
Originally Posted by mclaugj
i have a 1985 f-150 4.9 I have no spark out of the sparke plug wires I have eplaced the ignition coil the picup coil the ignition control modula the dis cap and rotor the coild wire and plugs wires still no spark ??
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Their is a relay that supplies power to the computer system. On later models it was along side the fender. It is the same size as the green fuel pump relay. Also their a ground wire next to the computer check this is tight. Sometimes in the pass. side kick panel. I've found both of these problems on Ford's of this vintage. Newer models top left side of safety wall.
Hold your finger on top of the relay and you can feel them pulse when turning key.