Question about Ford F-250

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I have a 1990 F250 7.5 4X4 I installed a new Dist and Coil and module it only will start once in awhile it rotates but won't start and I checked for fire and it has none only once in awhile will it have fire I checked the timing which is perfect it ran yesterday for 5 min then died and it had fire today for a few min then it had none I have checked all relays and they are good so what else can it be please help me

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From what your descibing and what you've replaced you've pretty much eliminated everything but a bad connection or a computer problem. You'll need a voltage and continuity tester.
The first thing to check would be your ignition grounds, don't forget the ground strap to the body and/or frame, this is an often over looked problem. Tug on them too, to make sure there solid.
Next thing to check would be is there power getting to the ignition, this will determine if the problem is the igntion or something else.
Another problem that is often overlooked is the ignition condenser, your truck is old enough to possibly have one. It's usually mounted on the coil or distributor.
Once you've eliminated these you're pretty much down to tracing wires looking for shorts or breaks, if you have a break it most likely is inside the wire without beaking the insulation.
You might also want to check for trouble codes, it's unlikely to help but it can't hurt.
Let me know how it goes, if this doesn't work I'll help you run through it by the numbers.

Posted on Jul 15, 2010

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