Will not Start after Engine Warms Up!

Reply Subscribe

Thread Tools

Search this Thread

Jan 21, 2006 | 09:35 AM

bspurlock

Thread Starter

New User

Joined: Jan 2006

Posts: 3

Likes: 0

Will not Start after Engine Warms Up!

I got a 1984 F250 with a 460, Holly 4 barrel. The truck will start fine when cold, but after the engine warms up it will shut off and not start again until the next day when it is cold. I've replaced the ignition box, distributor box, coil, spark plugs. When I pulled the new spark plug, they were burnt (black). I'm not a mechanic so is this caused by the carborator, or the ignition system? Any advise would great be apprecated.

Jan 21, 2006 | 09:58 AM

fordborn

Post Fiend

Joined: Jan 2004

Posts: 6,610

Likes: 2

From: Northwest, Arkansas

Welcome to FTE and all it's glory

. You are now part of the largest Ford Community on the net. Glad you chose to register and am sure your stay will be beneficial. Have a good time and see you on the Forums.

Besides all the great Tech forums here we also have local state chapters where people from the same area can get together for meets, parties, or just carry on general conversation. Take the time to check out the chapter in your local area.

To make it easier to navigate please read the Forum Guidelines.

Jan 21, 2006 | 01:00 PM

Dungeon_Master

Posting Guru

Joined: Dec 2004

Posts: 1,159

Likes: 0

From: Connecticut

Without actualy seeing it in action. It sounds like the choke might be sticking.

Jan 21, 2006 | 07:54 PM

Bdox

Fleet Owner

Joined: Sep 2005

Posts: 28,609

Likes: 18

From: Lake Tahoe, Nevada

I agree about the choke... Black plugs=rich condition Fits the symptoms

Feb 13, 2006 | 08:30 PM

bspurlock

Thread Starter

New User

Joined: Jan 2006

Posts: 3

Likes: 0

Truck running now. But....

Thanks for the advise. I checked the carb. and the electric choke was not working. So I replaced it with a manual choke which seemed to really help. I also cleaned the distributor and it runs most of the time. But even with the manual choke, it will start one time idling fast then the next time you start it up it idles to slow. When it idles to fast it will warm up and then shut off and I have to wait 30 minutes before it will start again. Could it be the float not working right? and if so, is there anything that I need to be aware of before I take the front off the carb to check and replace the float if needed?

Last edited by bspurlock; Feb 13, 2006 at 08:32 PM.

Feb 13, 2006 | 10:39 PM

Bdox

Fleet Owner

Joined: Sep 2005

Posts: 28,609

Likes: 18

From: Lake Tahoe, Nevada

Are you saying that it dies after warm up with the choke fully open?

When it dies do you have any backfire either through the carb or the exhaust?

Does it die while idling or while driving? Under load or coasting?

Did you change the plugs which you said were black? If you start with clean plugs you can pull them out after it dies to see what they look like.

Give us some more info to go on.

Feb 13, 2006 | 11:32 PM

bspurlock

Thread Starter

New User

Joined: Jan 2006

Posts: 3

Likes: 0

Yes it dies after the choke is fully open (sometimes). No backfire, just shuts off like you turned the key off. Or it will run fine until you shut it off then won't start again until you let set for about 30 minutes.

I changed the plugs right after installing the manual choke, but I have not looked at them since. I'll check the plugs again and see if they are clean or not.

Someone mentioned vapor lock on the fuel line. It has the two line fuel system so I thought that keeps it from vapor locking. But I may cover the fuel line anyway and see if that helps.

Thanks for any advise. I've learned more about engines and carbs. with this truck than any other vehicle. Kinda frustrating, but at the same time kinda fun trying to figure it out. I never thought I would enjoy working on something like this, but it gets addictive. Just glad its not my primary transportation.

Last edited by bspurlock; Feb 13, 2006 at 11:51 PM.