Please help!

[687 6.0]

Ok guys here is whats going on. I have a 2004 6.0 i run innovate tunes with egr delete axaust and intake. I am haveing a issue with a no hot start. I have changed o rings on the top of the injectors,checked stand pipe o rings,changed ipr. I have also noticed it is way down on power once the truck gets warmed up, is that normal with a oil leak? i have had this thing torn down 4 times now, So any help would be greatly appriciated. Thanks in advance.

[scotty2280]

any codes?

[firefighter317]

have you checked ICP while cranking when hot? it must see 500 psi before the injectors will fire. could be the hp oil pump leaking. watch the ICP and IPR duty cycle. IPR should read 14.84 koeo. last time I seen a hp oil pump go out, IPR was reading about 84%

[687 6.0]

well i dont have the setup to read that. but i did get a gauge put in where the icp screws in and while cranking it didnt do anything. then it fired up with out the icp in is that normal? i drove it and got it good and hot turned it off then it wouldnt fire back up.let it cool off a bit and started up and was reading right at 500psi on the gauge. let it sit for a hour or so fired it up and at idle it was reading 700psi. would this mean it is a leak or could my hpop be going south? thanks alot

[azkcr]

It's probably the threaded fitting that comes off of the HPOP.
They are known to blow out and cause what you're talking about. I doubt it's the pump.

[687 6.0]

Where is the fitting at? Do you pull the pump out to get to it? Thanks alot

[azkcr]

STC fitting install

[azkcr]

And it's on the back of the engine underneath the turbo. Not the easiest little bugger to get to. That's for sure.

[phoenixrhino2]

Check out this link below for some information on the STC (snap to connect) fitting. As mentioned it causes the no start condition when hot, then truck will fire once it sits and cools a while.

I know that you have a "04" and the TSB says 05-07, but sure sounds like you got the STC model from the factory;

http://ww2.justanswer.com/uploads/ti...sb08-18-06.pdf

[m-chan68]

'03-'04 6.0L engines use an aluminum swash plate style pump with a curved discharge tube atop the pump that connects it to the branch tube via a quick connect fitting that is similar to the STC fittings of '05 and up engines. However, on '03-'04 engines the banch tube is secured to the rear of the engine block with a bolt that prevents any rearward movement, thereby eliminating any chance of a blowout failure that occurs on almost all '05 and up pre-STC fitting update engines.

To the OP, you likely have a high pressure oil system leak from the discharge tube d-ring and/or weak high pressure oil pump causing your issue. To pinpoint this would require monitoring ICP psi, ICP volts, ICP desired and IPR duty cycle under all the conditions in which the problem occurs, along with carrying out a high pressure oil system air test. Is this an early-build 2004 or late-build 2004 engine?