2005 6.0 losing oil pressure no hot start

[tfloy]

I have a 2005 F350 6.0 ive had it in the shop for over a month. It has trouble starting, once started it will run rough at idle then smooth out, it will stay running until warm then will die immediately above idle rpms. The mechanics have replaced the entire high pressure oil system, rails, pump, manifold, injectors, sensors, everything and it still reads low pressure and dies after engine is warm, they are running out of solutions. Any ideas? or similiar problems?

[sinner6.0L]

condition of the oil and base oil pressure checked?

[tfloy]

Yes also had injector leaking fuel into the oil, they flushed the engine and replaced the oil, and injector, before the problem started though i would change the oil, and it would immediately be black and dirty. They checked the pressure both electronically and mechanically and it still showed up low.

[DEESLVRGN]

the o-ring on my dummy plug, no hot start

[tfloy]

Originally Posted by DEESLVRGN

the o-ring on my dummy plug, no hot start

Thanks. I'll check on this tomorrow. Anybody have any other suggestions?

[DEESLVRGN]

I never had a low pressure oil problem, maybe the oil pump?

[justinmix]

Just curious, is it a low oil pressure issue or a high pressure oil issue? Do you show oil pressure on your gauge when cranking during the no start condition?

I've seen severe high pressure oil leaks that bleed off so much oil it makes you have low base engine oil pressure.

I've also seen low base engine oil pressure issues that cause high pressure oil issues.

These can be tricky to diagnose but someone whose good on 6.0's should be able to tell you where the problem lies. Either there missing something on the high pressure side, or you have a low pressure issue that's being mis diagnosed. If your not supplying enough oil to the high pressure system it can make it look like it's a high pressure issue when it's not.

[justinmix]

If it is a low pressure oil issue it could be a few things. Possibly oil pump, worn front cover, cracked pickup tube. We really need to know what base engine oil pressure is during the no start condition. If it's building pressure there what is the ICP pressure during cranking?

[DEESLVRGN]

during craanking while hot I would always read good base oil pressure, after replacing everything I finally found the culprit which is in the pic above

[tfloy]

They are diagnosing it as a high pressure leak. When i would try to start it it would crank and would show no pressure on the gauge and would never fire. On the times the engine would start, i would be cranking it then the gauge would shoot up all of the sudden and the engine would fire, it was as if it had no pressure then built up enough to start all of the sudden.