Here's a weird one!
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Elder User
Joined: Aug 2002
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From: CA
Here's a weird one!
I'll figure this out eventually, but I find that when I post problems here, I tend to figure them out faster! Imagine that!
My '73 F-100 with 302 and manual tranny has the old stock 2bbl, which has been rebuilt and seems fine. Everything (choke, etc.) seems properly adjusted. Okay, here's the problem. When I first start it in the morning, it runs just like it should. Idle a bit high from being on the choke step, choke almost closed, running int the warm-up mode just as you'd suspect. Twenty minutes later, usually just as I pull into my parking space at work, or on the road if I'm traveling.....it dies. Then it's a little hard to start, but once started, it runs great the rest of the day!!
I've run out and popped the hood just after it dies and everything looks good. By then, it's on the normal idle step and the choke is open. In other words, there are no visual indicators of a problem. And as I said, it's a little rough to re-start (acts almost like it's too lean) but once started it runs great and no further problems until 20 minutes of use the next morning!!
Like I said, I'll figure it out eventually, but what do you guys think?? Thanks, Polkat.
My '73 F-100 with 302 and manual tranny has the old stock 2bbl, which has been rebuilt and seems fine. Everything (choke, etc.) seems properly adjusted. Okay, here's the problem. When I first start it in the morning, it runs just like it should. Idle a bit high from being on the choke step, choke almost closed, running int the warm-up mode just as you'd suspect. Twenty minutes later, usually just as I pull into my parking space at work, or on the road if I'm traveling.....it dies. Then it's a little hard to start, but once started, it runs great the rest of the day!!
I've run out and popped the hood just after it dies and everything looks good. By then, it's on the normal idle step and the choke is open. In other words, there are no visual indicators of a problem. And as I said, it's a little rough to re-start (acts almost like it's too lean) but once started it runs great and no further problems until 20 minutes of use the next morning!!
Like I said, I'll figure it out eventually, but what do you guys think?? Thanks, Polkat.
Laughing Gas
Joined: Oct 1999
Posts: 1,165
Likes: 3
From: central Alberta
Here's a weird one!
I had exactly the same problem with a car once (actually a few times :)) At the same place every morning on the way to work it would die. I'd let it sit a couple of minutes and it would be fine. Turned out there was enough crap in the tank to plug the strainer after a certain amount of time. When the car was shut off, the suction stopped and the stuff would float away. I'd drop the tank and clean it out.
mike
mike
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Here's a weird one!
Does this only happen in cool weather?
Check to make sure your OEM air cleaner box is installed with the manifold heat riser tube in place. Make sure your diverter valve and thermostatic vacuum switch(s) in the air cleaner work properly. Check the heated intake air system for proper operation.
This is not so weird, it happens all the time.
Check to make sure your OEM air cleaner box is installed with the manifold heat riser tube in place. Make sure your diverter valve and thermostatic vacuum switch(s) in the air cleaner work properly. Check the heated intake air system for proper operation.
This is not so weird, it happens all the time.
Last edited by Torque1st; Jan 22, 2003 at 07:08 PM.
Fleet Mechanic
Joined: Sep 2002
Posts: 1,769
Likes: 7
From: Gretna ,LA.
Here's a weird one!
IF it still has point ignition,i have seen the condenser do that very thing. it get,s hot and quits. it might be a strange coincidence that it happens at the same place. next time it quits try some gas in carb while jumping solinoid to see if its fuel related.if if isnt fuel you know where to look. i have a 74 F100 302 3 spd manual everything.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Here's a weird one!
Make sure your heated air intake is working first. If it isn't, the gas trick will tell you nothing. When it happens take a look down the carb and see if there is a little moisture around the venturi, -the remains of a little ice.
Posting Guru
Joined: Aug 2002
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From: clementsport canada
Here's a weird one!
i'm with torque on this one. sounds like a carb startin to freeze up, happens fairly often up here , kinda of a live with it thing.... if the carb is extremely cold, there's probably some icing in there
Posting Legend
Joined: Sep 2001
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Here's a weird one!
Thanks Bull! That is exactly what his problem sounded like to me. I have been there. 
You can avoid it entirely with the OEM heated air intake setup.
If you are running one of those "open" aftermarket chromie air cleaners, replace it, they are only fit for trailer queens.
The OEM's did not put all of that stuff on there for fun. It cost them $$$.
You can avoid it entirely with the OEM heated air intake setup.
If you are running one of those "open" aftermarket chromie air cleaners, replace it, they are only fit for trailer queens.
The OEM's did not put all of that stuff on there for fun. It cost them $$$.
Last edited by Torque1st; Jan 23, 2003 at 04:51 PM.
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From: CA
Here's a weird one!
Thanks for all the responses guys! It turned out to be something different, although you are right in guessing that my warm air setup was not connected (most of it was missing when I got this one!), and I do intend to make that right.
The problem turned out to be an idle screw. The little spring that holds these screws in adjustment was weak, and the screw was moving around from viabration. It had backed itself out! The screw in the other barrel was okay, and was just barely keeping the truck idling after warm-up! Seems the truck was actually flooding a little bit before warm up (after too, but as I said, it apparently wasn't flooding enough after the choke opened). Ain't it always the last thing you look at?!
The problem turned out to be an idle screw. The little spring that holds these screws in adjustment was weak, and the screw was moving around from viabration. It had backed itself out! The screw in the other barrel was okay, and was just barely keeping the truck idling after warm-up! Seems the truck was actually flooding a little bit before warm up (after too, but as I said, it apparently wasn't flooding enough after the choke opened). Ain't it always the last thing you look at?!
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Joined: Sep 2001
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Here's a weird one!
You said all of that stuff was OK and the truck was running great otherwise
We can only work with what you give us.
Glad you found the problem tho, -and get that airbox fixed.
My '73 F-100 with 302 and manual tranny has the old stock 2bbl, which has been rebuilt and seems fine. Everything (choke, etc.) seems properly adjusted. Okay, here's the problem. When I first start it in the morning, it runs just like it should. Idle a bit high from being on the choke step, choke almost closed, running int the warm-up mode just as you'd suspect. Twenty minutes later, usually just as I pull into my parking space at work, or on the road if I'm traveling.....it dies. Then it's a little hard to start, but once started, it runs great the rest of the day!!
Glad you found the problem tho, -and get that airbox fixed.
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Elder User
Joined: Aug 2002
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From: CA
Here's a weird one!
Yea Eric. guess I somehow overlooked that spring! Seemed to have tension on it, but it did it again after I found it. Changed out both springs and it seems fine now. So now for the air box.........