F250

Have you tried switching out the coil? I have seen them stop firing when hot and work again when it cools off.

Gary Ryan San Antonio.TX.

john is right, there's something in the carb, probably getting in the jet. that's why it will idle but not run.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

Just because a spark will jump across a spark plug with it removed from the head doesn't mean it will spark when exposed to the pressure inside the cylinder. You need to get another spark plug and bend the ground electrode back so that you have a gap of about 1/4". As soon as the engine dies remove any plug wire and connect it to your modified plug and crank the engine over. If you do not get a spark that looks like a lightning bolt jumping across the 1/4" gap you have an ignition problem.

You can run the engine with a remote fuel source using gravity to feed the carburetor. This will completely eliminate the fuel system. If it still happens, you know its not the fuel system. If it no longer happens, something in the fuel system is causing it.


Lawrenceville, GA

yes it had a resistor stock but not now. I completly rebuilt the truck from the frame, it has a brand new EZ-wire wiring harness.

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'59 F-250 Styleside Longbed, 292, 4spd, Rockwell 5.83 dually running gear, custom NP205 overdrive.

"The truck's a Ford and the tractor's green"

I didn't realize that the resistor wires went that far back. I thought it was more like mid 60's. If that's what its got, thats the first thing I would check. I remember when people traded a vehicle because they couldn't figure out what was wrong with it and the next owner fixed it in 5 minutes.

Kenneth

Fredricksburg, Texas

That truck will have a resistor wire. It's not as obvious as the resistors used on other, newer applications.


Lawrenceville, GA

There is no resistor, wire goes strait to the coil/pertronix unit. 12v electrical system.



I will try to wire the ignition directly to the battery. I will also check more into the carb being gummed up.

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'59 F-250 Styleside Longbed, 292, 4spd, Rockwell 5.83 dually running gear, custom NP205 overdrive.

"The truck's a Ford and the tractor's green"

I had a 73 bronco that did the same thing turned out it was the ignition switch  just a thought shakey (cheap fix)

I agree wit Eddie. Do you still have a resistor? You stated you still had fuel in the carb after it dies so that rules out a fuel delivery problem. You also said that you can see a spark misfire. I would concentrate on a ignition related issue. Hook a wire directly from the positive side (assuming neg ground) of the battery to the positive terminal on the coil and run again to see if problem goes away. Don't do this if you have a 6 volt Pertronix unit, instead install a new resistor and hook power from positive on battery to resistor. This will eliminate other electrical causes from the equation.

1956 Fairlane Victoria (ORREO)

 

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