Question about Ford F-250
It sounds like the TFI Module may be defective, this is the heart of the ignition system, it is a black or grey module with about 6 wires plugged into it on the side of the distributor (it may also be mounted on a finned heat sink on the inside of the left front fender), In rare cases it is the another ignition componet like the ignition coil or distributor stator, make sure you check the coil wire and the distributor for any signs or of being damaged (dist cap and coil lead need to be replaced), white powder on ther coil or distributor terminals is the give away of damage.
Also perform the following test, check with a 12 volt test light: On the coil primary ( connector at coil) there are two wires, one is red. Make sure you have voltage at this wire with the key on, then probe the other wire, usually green, crank the engine and this circuit should blink. If it doesn't, make sure the distributor turns, if it does then replace the ignition module and the stator inside the distributor.
I recommend you use Motorcraft or Ford parts. The aftermarket modules can be a problem as far as reliability. If the distributor rotor doesn't turn when you crank the engine, then you may have a timing gear problem
Posted on Jul 25, 2008
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