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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Will not start back up after Driving

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Old Dec 14, 2014 | 05:42 PM
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Will not start back up after Driving

1980 F250 carbureted will not start back up after driving.Have to let truck sit for 2 to 3 hours before it will start again.Carb getting fuel and have spark at coil.Was running ok and started pulling out on to street and truck just stop running.Had to let cool before starting back up. Have the Duraspark 2 electrical system.Does not have the TFI-VI system. Need help on this one. Thank you.
 
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Old Dec 14, 2014 | 07:02 PM
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Not to question your veracity, but how do you know the carb has gas? Do you see a stream(s) from the accelerator pump? If not, there may be gas to the carb but not in the carb.

As for the spark, was it blue or white? If not, you may have a weak spark due to a component failure, and that isn't unusual on these. And a weak spark may not let the engine run.
 
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Old Dec 14, 2014 | 07:36 PM
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Will not start after driving

Yes have strem from pump and spark is blue. Thanks.
 
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Old Dec 14, 2014 | 07:51 PM
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Then your fuel mix must be way off. Like maybe the choke is never coming off and you have to wait for the engine to need the choke before it'll fire?

Tell us more, like what engine you have and what's been done to it.
 
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Old Dec 15, 2014 | 08:31 AM
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Yes, if you have spark and fuel the only thing I see it could be is a flooded engine. Hold the gas pedal to the floor and crank it. If it starts to hit keep it to the floor till it fires up and then let off of it a little bit so you won't over-rev the engine.
 
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Old Dec 15, 2014 | 08:51 AM
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Yes. And, for garycd, that process uses what is known as the "choke unloader", and that is engaged at full throttle. Obviously that's not something you want to do for very long.
 
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Old Dec 15, 2014 | 02:54 PM
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Will not start after driving

I think it is electrical.When this first started I was driving and it died on me as I was driving.Had to let it cool for 2 hours before it would start again.Going to test coil,ballast resistor and distributor stator.Any thing else I can test? 1980 F250 351m stock. Thanks.
 
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Old Dec 15, 2014 | 05:59 PM
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Check the voltage to the coil in Run. Should be about 7v. That checks the ballast resistor, which is buried in the wiring.
 
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Old Dec 16, 2014 | 01:37 PM
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Will not start after driving

Checked voltage and checked 7v and then checked ohms on ballast resistor and came up with 0.1ohms not the 0.8 to 1.6 needed. Would the ballast resistor make it not run when it gets hot? Thanks.
 
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Old Dec 16, 2014 | 01:43 PM
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Originally Posted by garycd
Checked voltage and checked 7v and then checked ohms on ballast resistor and came up with 0.1ohms not the 0.8 to 1.6 needed. Would the ballast resistor make it not run when it gets hot? Thanks.
How are you checking this resistor? It's made into the harness wiring. If it wasn't working you would have gotten 12v at the coil, not 7v.
 
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Old Dec 16, 2014 | 02:14 PM
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Will not start after driving

In my Haynes manual it is showing me to test from + of coil to red wire coming from igition module. Thanks.
 
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Old Dec 16, 2014 | 02:35 PM
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It doesn't really matter what the ballast resistance is if you get ~7v at the coil. It was the voltage the engineers were targeting and the resistance was just a way of getting there.
 
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Old Dec 16, 2014 | 03:06 PM
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Will not start after driving

Book did say if 7v skip ballast test,but I did the test anyway. Unpluged the two wires from module and test red wire from harness to + wire to coil and came up with the reading of 0.1 ohms. Going to test again with wire unpluged from coil.Did not test with wire off coil first time. Thanks.
 
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Old Dec 16, 2014 | 03:48 PM
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Will not start after driving

I just tested the coil and it has no ohms at the posts.I should get 0.8 ohms at least right? Thanks
 
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Old Dec 16, 2014 | 04:00 PM
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By "no ohms" do you mean a dead short or totally open? It should be showing some resistance and I do think that .8 is about right - though that is from memory.
 
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