03 F250 6.0L no start when hot - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 08-03-2013, 01:41 PM Thread Starter
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03 F250 6.0L no start when hot

Neighbors truck starts fine when cold and has good power. He can drive normally with no issues as far as he wants. But when shut down it will not start. Just crank. This will happen after 2 miles of warmup or 20 miles. But runs good when it does start. A "mechanic" told him it needs a new HPOP. I'm thinking ICP or o-rings somewhere, perhaps standpipes, dummy plugs or the HPOP itself. If the HPOP was junk wouldnt he have trouble running and cold starting?

2005 F250 XLT FX4 SuperCab
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post #2 of 6 Old 08-03-2013, 03:15 PM
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Is the dummy oil pressure gauge working on the dash? 03 and 04 models were common to have a bearing blow out of the machined hole on the HPOP. My 04 had similar symptoms, but with no oil pressure on the dash. I took out the HPOP, sure enough there was a big hole. I tapped it out 1/4 NPT and threaded a plug in there with loctite. Runs great now. But I think if that's the case the gauge will be 0 when trying to start warm, at least that's what mine did. Besides that it could be just about everything you mentioned. Your neighbor needs to get a good scanner on it, see what the ICP is, also the IPR % desired vs actual readings. HPOP could be going south, but I'd think he'd run into other problems as well.

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post #3 of 6 Old 08-04-2013, 12:57 PM
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First do a air pressure test, then see whats next, dont rush into the problem
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post #4 of 6 Old 08-05-2013, 12:12 PM
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^^^ Agreed

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post #5 of 6 Old 08-05-2013, 01:12 PM
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Sorry, I didn't mean to sound like "do this and it will be all better" I was just sharing what ended up being wrong with my truck when I had similar symptoms. I only shared this because with an air test the HPOP would fail in this scenario, but instead of paying $650 for a new one, you can buy $5 worth of parts and fix it yourself.

2004 F250 XLT 6" lift, 37" tires, zoodad, T6,
edge cs, k&n, revx, warn lockers, rhino bars
future: coolant filter, headstuds, bluespring, 4" turboback, tires..dam these tires

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post #6 of 6 Old 08-05-2013, 05:05 PM
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hey guys new to thread but hoping I can help...just wondering does your neighbors truck have an extended crank when the motors cold also.. like 7-8 seconds then it fires over? if so your problem is most likely the o-ring seals in the bottom of the tube that pick up the oil to turn the motor over. what happens is when the oil is cold it is "heavy" and still has a lot of viscosity to is so when the oil tube is leaking down it takes an extended cranking period to build 500psi to detonate the fuel in the cylinders. and when the truck is hot it will just crank and crank bc the oil is so warm and loose that the o-ring that is blowing past cant hold enough pressure back to build your 500psi..i know im bad at explaining things but I hope this helps. its needs a new dummy plug there only like $25 bucks but its like a 4hr fix bc you need to pull the valve covers which means everything under the hood has to come off.
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