iam helping out a friend of mine with a 06 f350. it will start fine when cold, but when it is shut off, it will not re-start until it cools off for about an hour or so. it is not overheating and i cant pull any codes. the CEL is not on either. any suggestions? thanks in advance.

 

Most common cause for a no start when hot is a hpop leak. Do a search for this and you will come up with lots on it. There could be other causes but this is the most likely.

 

how can i check for leaks? i did some searching and havent really gotten a clear answer.

 

Deleted. I should read things closer.

 

How willing are you to remove the FICM, turbo, intake manifold, and the EGR cooler to get to the HPOP cover and HPOP itself for troubleshooting? Otherwise:

One way to diagnose for an HPOP leak without a teardown: Remove the ICP sensor --- use this hole to pressurize the HPO system with air (for you, the ICP is on the passenger side valve cover). I believe you would then need to have a way to send 12V power to the IPR, but only for 30 seconds or it will burn out.

Remove the oil fill cap, remove the CCV hose that goes into the air intake from the other valve cover, take a piece of heater hose and listen in BOTH spots after commanding the IPR valve to close (again - only for 30 seconds). If you hear air coming from either one it's probably a leak in one of the oil rails. If you hear air coming from BOTH sides it's probably the HPOP or STC fitting.

Note - I have not done this procedure, so if a Tech or other FTE member would care to correct any mistake I have made, I would appreciate it.

Also -

If IPR is at 80% while at hot idle, then you have high pressure oil leak, failed pump or a bad ipr valve.
IPR should be around 22-24% at hot idle; up to maybe 30% but that maybe a little too high.

Lastly:

There is a hole that is situated just above the HPOP drive gear. If air is heard/felt exiting this hole when air testing, this is normal if IPR duty cycle is not commanded to 100% because that is the exhaust passage. The way to condemn a high pressure oil pump is to air test it with the turbo oil supply tube removed from the top of the oil cooler base. If air is heard/felt from this port during air testing, the high pressure oil pump is bad.

 

Ck the "tech folder" for "no start trouble shooting"-- will give you tips to find the problem. I am having the same problem and will dig into it next week. High pressure oil pump is in the valley under the turbo. You could have a bad icp sensor, seal blown in the oil rails or a leaking fitting on the pump. The worst case is the pump which is around $800 for the part. Good Luck

 

I may go the air pressure route. How much pressure should I use or is there a such thing ad too much?

 

100 psig .

 

Do you have any details on energizing the ipr?

 

Most common spot on an 06 would be the STC fitting on the HP pump. Dummy plugs in the rails, the stand pipes that feed the rails, and the o-rings that seal the injector to the rails are the next place to look. If you are lucky like me, you could have the worst spot to leak and that would be the branch tube. That one is a doozy to fix. Luckily warranty fixed mine.

 

At This point I really don't care What it is ad long as I can find it

 

Is there a reason this truck smells like ether?

 

has anyone done this pressure test before? iam trying to do it now, and see to way to get to the IPR without pulling the turbo.

 

You should be able to remove the IPR harness without removing the turbo.

Remove the coolant reservoir and take the FICM and bracket off and remove the last intake bolt (and possibly the last valve cover bolt on the top edge) so you can get your hand back and unplug the IPR. Be VERY careful w/ the FICM connectors!

To command the valve - you can use an old ipr connector from an old harness wired to a cig. lighter plug and only keep it pluged in for 30 seconds not to damage the ipr. Try asking a tech at your local ford dealer, maybe one will be nice enough to snip one off a harness thats laying around.

 

This may help:
Diesel Technician Society