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Discussion Starter #1
Ok so here's the problem 89 f-250 w/5.0 manual. New Battery. Starts just find when cold. run it a little and get it a little warm starts like a dead battery? cool off starts just fine

what gives

now heres the second part, when you reply to your solution ... Why is it a solution?
 

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Bad starter is the most likely assuming that you cleaned all of the ends of all of the heavy cables.

When the starter is cool/cold although it is old and weak it will spin the engine, but when it gets hot, there is more resistance, and the battery can't overcome the additional resistance.

I just replaced the starter in my 1990 Bronco. I owned it for a couple of years and it always cranked a little slowly but OK. Now that there is a new starter in there... that baby really cranks up.

Here is my thread on the issue
http://www.fordforumsonline.com/forum/engine-drivetrain/140-turn-key-all-i-get-click.html
 

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Discussion Starter #3
ok second though, is it possible the the brushes and winding cause a problem when heated ... oh and the positive cable was really hot one day
 

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Resistance of copper wire (in the cable and in the windings inside the starter) changes as it gets warmer. Based on Ohm's Law, if the voltage is constant (12 V), then the amount of current (power to spin the starter) is reduced as the resistance increases.

If the cables are gettting hot, replace them. See if you can find a replacement that is a larger diameter (smaller gauge). Welding shops will custom make cables if you can not find something suitable or search the web.
 

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ok second though, is it possible the the brushes and winding cause a problem when heated ... oh and the positive cable was really hot one day
lol... which part of the starter did you think I was referring to when I said "When the starter is cool/cold although it is old and weak it will spin the engine, but when it gets hot, there is more resistance, and the battery can't overcome the additional resistance." ?
 

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Could this also be because of the dreaded heat soak that small block chevy owners encounter when they run headers without a heat shield? i've run into the occaisional Ford with this problem with a brand new starter. Once it cools off, it fires right back up. Just a thought.
 

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Fortunately pulling a starter is as easy as two bolts and a connection. It almost takes as much time to get your tools out, and something to lay on.

ANd Zephyrman, great suggestion. "dreaded heat soak that small block chevy owners encounter when they run headers without a heat shield"
 

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Discussion Starter #9
Now i understand ... change the starter ... bigger cable ... got it!
 

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LOL... a week later, I thought you were posting that you changed the starter and now it works great!

Please give us an update, when you get around to it.
Enjoy the weekend.
 

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if not, it could be the starter solinoid, mine was doing that for a while, until i replaced it. it wouldn't disengage if too cold, and wouldn't complete the circuit if too warm. finally i just replaced it, fires up firts time everytime, unless batt is dead, but that's another story...
 

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Discussion Starter #12
well i finnaly said there is so much **** wrong from sitting i hope ... i said here buddy at ford it your 89 bucks and i know everthing that is wrong with it
 

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I don't understand you post, I think you gave $89 to a ford dealer for diagnostics.

I hope you are happy with that decision.
For $70 I bought and replaced my starter in my Bronco.
Good luck
 

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Discussion Starter #14
I don't understand you post, I think you gave $89 to a ford dealer for diagnostics.

I hope you are happy with that decision.
For $70 I bought and replaced my starter in my Bronco.
Good luck
it wasn't just for the starter, it was to find out why the truck is running rough, valves, rings, or injectors, there is something wrong with the transmission, as in the clutch was put in wrong or something by the orginal owner, etc. there doing all of that and a couple other things ... for that price.
 
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