won't start when hot HELP

[papigboy]

94 F350 125000 cranks over fine,wont start when ran over 30 mins.Had towed
to ford shop,started right up left there for 2 days ,started every time they tried it.picked up truck ran 40 mins hard to start cranks fine,took immediately
back to dealer where it didnt start tech checked it out had to replace one battery .I bought battery from dealer and installed,at the dealers tried to start turns over good but didnt start got tech to come back out to check it out few more minutes go bye and starts right up for ford tech no codes found said could be cam sensor bought one and installed myself when home next day,drove around chrismas shopping and had same trouble starting when running awhile,set for 30-45 minutes starts up,replaced fuel filter also
tried few more times today only does it when hot no other leaks found any help appreciated

[bigcountrysg]

is it cranking when it is hot. What made the tech think it is a battery if the engine is cranking when it is hot. If it is not cranking when it is hot, I have seen this on vehicles before and it would be the starter is bad. Starts fine when cold but won't do nothing when hot. But if it is cranking when it is hot then I don't know what it would be. Maybe the glowplug relay.

[papigboy]

The truck crank's but just won't fire off.

[papigboy]

It is actually a 95 powerstroke

[coozie]

Next time it happens unplug the icp and try it . It might be sending a wrong single to the pcm and that controls the ipr which control the oil pressure to the injectors. Hope this helps you at least it won't cost you anything to try. That is what I found with mine

[~CrazyDiesel~]

Would not be the glow plug relay when hot.


If you're spinning over, like coozie suggests, unplug your ICP, then try it.

Also, while you are cranking, have you tried giving it pedal? If it was ICP related, and it was reading it too low, and the IPR was kicking it too high, it would not start, until you goose, in whicih it would thing spring to life very harshly.

Another possiblity is your under valve cover wiring harnesses.

I forget what happens if you unplug your IPR, and try to run it, but you may also try that.

[Deereman39]

Could be orings on IPR sensor,or could be dirty and sticking.
Cheers Ed