wont start when hot
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Freshman User
Joined: Jun 2003
Posts: 30
Likes: 0
wont start when hot
I have a 78 F150 4x4 with a 351M runs fine now (finally,after a lot of work)but the engine has less than 5000 miles on a reman.
My problem is after running awhile (a few miles) I shut it off and it wont restart till I let it cool down.
What Gives???????????
My problem is after running awhile (a few miles) I shut it off and it wont restart till I let it cool down.
What Gives???????????
Posting Guru
Joined: Jun 1999
Posts: 2,415
Likes: 3
From: Comox Valley, Canada
wont start when hot
When you say wont start do you mean it wont turn with the starter or it turns but wont fire?
If it wont turn...could be starter or wires or even timing to far advanced.
If it turns over but wont start...do you have spark? if not could be the coil or the ignition module.
Or do you have spark but no fuel ?? if no fuel could be fuel line getting too hot and "vapor locking".
Or maybe the fuel is boiling out of the carb and flooding the engine...try holding the pedal to the floor and see if it starts.
Hope this gives a few ideas, if you tell us more of the symptoms we can be of more help
If it wont turn...could be starter or wires or even timing to far advanced.
If it turns over but wont start...do you have spark? if not could be the coil or the ignition module.
Or do you have spark but no fuel ?? if no fuel could be fuel line getting too hot and "vapor locking".
Or maybe the fuel is boiling out of the carb and flooding the engine...try holding the pedal to the floor and see if it starts.
Hope this gives a few ideas, if you tell us more of the symptoms we can be of more help
Thread Starter
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Freshman User
Joined: Jun 2003
Posts: 30
Likes: 0
wont start when hot
The starter will turn it but almost sounds as if battery is dead.But I have new battery,plugs,wires,solenoid,fuel pump,fuel lines,starter.
Cools off after a few minutes and runs fine again
Cools off after a few minutes and runs fine again
More Turbo
Joined: Jan 2001
Posts: 574
Likes: 0
From: New England
wont start when hot
I agree. The timing sounds to advanced. maybe have the vaccum advance line on wrong port of your carb?? thats a common mistake.
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Posting Guru
Joined: Jun 1999
Posts: 2,415
Likes: 3
From: Comox Valley, Canada
wont start when hot
I still vote for timing but...check and make sure the battery + wire to the solenoid, the starter wire from the solenoid to the starter and the battery - wire have clean tight connections and the wires arent frayed/ corroded.
Also make sure the wires are large enough...I like to run doubled 6awg for all of them. Gives the starter as much oommpphh as it needs
Also make sure the wires are large enough...I like to run doubled 6awg for all of them. Gives the starter as much oommpphh as it needs
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Posting Guru
Joined: Feb 2002
Posts: 2,404
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From: Cleveland, WI USA
wont start when hot
I'd bet dollars to pesos the starter is getting too much heat from the exhaust.
As I stated in another post, I had the exact same problem and installed a piece of aluminum between the starter and y-pipe. It made a definate difference, but I could still use more insulation.
Maybe try some of that header wrap around the exhaust near the starter.
Just a thought.
Kevin K.
As I stated in another post, I had the exact same problem and installed a piece of aluminum between the starter and y-pipe. It made a definate difference, but I could still use more insulation.
Maybe try some of that header wrap around the exhaust near the starter.
Just a thought.
Kevin K.