no start when hot, changed ipr o-rings, new cps

[blt93932]

My 99 powerstroke had a problem taking longer and longer and longer to start, I finally replaced the started and solved that problem, but immediately after I replaced the starter it wouldn't start. It started with a jump, but when it ran for a few hours and I shut it off it wouldn't start. Sometimes it does, most times it doesn't. I replaced the batteries, replaced the CPS, even put new orings on the ipr (old ones looked perfect, good measure). Any idea what this could be? Oil level looks good.

I do have aftermarket tunes, but they never gave me a problem before, and the problem happens whether the chip is plugged in or not.

[losfinch]

Well check the glow plugs for one thing and the glow plug relay to make sure they're both working properly. Do yoy get any white smoke when it finally starts up?

Does it happen only when its cold? Only when its hot? Only cold would point to glow plug system. Only hot would point to high pressure oil system (IPR, HPOP, leaks). Have you tried unplugging the IPR and then trying to start it?

[Dietoremain]

Truck wont run with IPR out, ICP you can unplug and truck will run though.. check your icp sensor??

[blt93932]

The condition is no start when hot only.

I checked the o-rings on the IPR, they looked fine, but I replaced them anyway. When it doesn't start, unplugging the ICP doesn't change a thing.

I can also get the truck to not start by rapidly shutting it off and turning it on, this caused a no start condition for 2 days! After a few days it started again.

If there was a HPOP leak would I be burning any oil?

[justinlogue5_0]

Did you ever figure it out?

[GAS]

Does the oil pressure gauge read as soon as you start cranking? or pops up just before it finally starts. If the later, then i would suspect excessive wear/clearance in your low pressure oil pump.

[corbin86]

Will your truck start if you add some fuel in the intake. Mine had this problem wear it would start after i shut down but as time when on it got worse and worse i thought it was my ipr valve so i changed the o ring with no result so finaly i got frusterated and took it to the shop. they swore it was the ipr and i told them what i had done and they still insisted on the ipr so they changed it and it turned out not to be that and finaly they changed the HPOP and that fixed. The HPOP was worn just enough that when the oil was still hot it was thinner not letting it build up pressure to fire the injectors hope this might help my truck had 120k on it