300 CID Running Issues/Carb?
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300 CID Running Issues/Carb?
I have a 1980 F100 three-on-the-tree that is having issues running. It will start just fine, but for some reason it keeps cutting off on me, and doesn't always start back up. After it sits for a few minutes it usually starts back up but 30 seconds later or even 30 minutes it'll cut off again. It can happen anytime, braking, shifting, accelerating and idling. Ive gone through and taken apart the carb and.cleaned it, but did not rebuild it bc the kit I bought was wrong. Can it be the fuel lines? Maybe something to do with the ignition? I replaced the distributor/plugs/wires last spring and cleaned them up last month, but Im stumped on this. Can anyone help?
Lead Driver
Joined: Jul 2009
Posts: 6,477
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From: Sheffield, AL
Welcome to the forum, kj2wilson!
The 1980 has a Duraspark ignition module mounted on the driver side inner fender. When these go bad, often times they will act as you have described. Take the module to a parts store and it can be tested, however, sometimes they will indicate OK, when cool, but act up when they heat up.
If you know someone with an older Ford or Mercury [~1975-1983], you could swap the module and see.
If you find out that it is defective, it is recommended to get Motorcraft if possible. Some of the newer "off shore manufactured" modules do not have a good reputation for longivity.
By the way, scroll down the list of forums and you will find one specific for the 4.9L and 300 six cylinders. They, too, will be happy to assist you.
Good luck!
The 1980 has a Duraspark ignition module mounted on the driver side inner fender. When these go bad, often times they will act as you have described. Take the module to a parts store and it can be tested, however, sometimes they will indicate OK, when cool, but act up when they heat up.
If you know someone with an older Ford or Mercury [~1975-1983], you could swap the module and see.
If you find out that it is defective, it is recommended to get Motorcraft if possible. Some of the newer "off shore manufactured" modules do not have a good reputation for longivity.
By the way, scroll down the list of forums and you will find one specific for the 4.9L and 300 six cylinders. They, too, will be happy to assist you.
Good luck!
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Thank you for the quick reply. I'm at work right now but I will find out if that is the problem. Is it possible to be something else? The other day when I was trying to crank it, it was refusing to start so I played with the throttle myself and when I sat back in the cab it started on its own...just trying to be thorough.
Freshman User
Joined: Feb 2012
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From: Southern Oregon
I have a 1980 F100 three-on-the-tree that is having issues running. It will start just fine, but for some reason it keeps cutting off on me, and doesn't always start back up. After it sits for a few minutes it usually starts back up but 30 seconds later or even 30 minutes it'll cut off again. It can happen anytime, braking, shifting, accelerating and idling. Ive gone through and taken apart the carb and.cleaned it, but did not rebuild it bc the kit I bought was wrong. Can it be the fuel lines? Maybe something to do with the ignition? I replaced the distributor/plugs/wires last spring and cleaned them up last month, but Im stumped on this. Can anyone help?
Moderator
Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
I agree to do some actual diagnosis on it... when it dies, check for spark and fuel, proceed based on the results... the ignition module is a common culprit and can be checked at an auto parts store.
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What's the part number on the ICM? I don't want to get the wrong one. I know the truck has spark. It turns over just fine and when it does run there's no miss firing or anything of the sort. Could it be the fuel lines being clogged? There's nothing in the fuel filters and I have two on there, one before the pump and one after.
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Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
It has spark when it runs, you need to check for spark when it dies.... don't just take guesses as to what it could be, do some diagnosis to see what it is.
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