[gbb]

Good old 2004 with 600,000km Motor only has 300k, No mods or EGR delete. Has had new HPOP and fitting as well as standpipes etc. Starts good in cold. Had to resolder FICM power supply lately. ICP over 700 on cold start. As reaches operating temp(180) ICP drops to high 400's then shudders and stalls. Sits few minutes and starts right up. IPR at 85%. What is failing?
Something that has been changed already?

 

[6riders]

Pressure test the hpo system. There are so many parts involved in this system, it could be anything from stand pipes to oil rail seals or the pump itself.
Don't throw money at it until you test for leaks.

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[bismic]

It would be good to know if your 04 is an early one or a late one.

 

[gbb]

Stand pipes,dummies. Hpop and fitting were done a while ago. Pressured up and can't hear any leaks. It is a 2006 motor.
My other one is a 2003 and is lower mileage at 475k.

 

[bismic]

From your data, you have a leak, the IPR valve is giving you problems, or the HPOP is bad.

Did you do the air test at the IPR port, or from the ICP sensor port?
What air pressure did you use?
Were you able to do the air test with hot oil?
Did you do the air test with the valve covers off?
Did you listen carefully at the oil fill tube, the CCV opening, the turbo drain, and the oil filter housing (w/ the oil filter removed)?

Also, when it is hot and it won't start, what rpm is it cranking at?

 

[gbb]

I did pipes once and new HPOP and fitting. My original question was if modded does problem reappear? Only pump with 120 psi when hot. Using a Genesis scanner. Yank IPR next? Icp reads 7. 70 cold. Once op temp reached drops below 500.

 

[bismic]

I saw where you posted that you changed the HPOP and the STC fitting. That doesn't really guarantee anything though. Based on what you posted, it is clear that you won't start because the ICP is under 500 psig. We don't know if you did the work properly or not, maybe a replaced part has failed. Over the internet who can tell?

If you answer the questions I posted, perhaps we can help. If not, then pull the IPR as the next step.

 

[gbb]

It actually starts good when cold. When hot is stumbles and quits. Sit for like 5 minutes starts right up again which to me eliminated HPOP. Thinking of making a pressure setup with gauge and monitoring level. When STC fitting let go it wouldn't start. Pipes were just done to aid on warm startup.

 

[6riders]

OK, sit and argue with the people trying to help you.
I think your oil rails have cracked, your starter is shot, you need a new ICM and your injectors are bad. Don't forget to replace the oil cooler, or delete it all together.
It'd probably be best to replace the whole truck and get a cheby

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[gbb]

Pressured to 110. Can't hear any leak anywhere when oil temp at 180F. Have to warm truck up as 15F here.

 

[bismic]

From your data, you have a leak, the IPR valve is giving you problems, or the HPOP is bad.

Did you do the air test at the IPR port, or from the ICP sensor port?
What air pressure did you use?
Were you able to do the air test with hot oil?
Did you do the air test with the valve covers off?
Did you listen carefully at the oil fill tube, the CCV opening, the turbo drain, and the oil filter housing (w/ the oil filter removed)?

Also, when it is hot and it won't start, what rpm is it cranking at?

I didn't see these questions answered. The details do matter.

In an air test, you aren't necessarily watching to see if the pressure holds. The intent is to keep a constant supply of air on the high pressure oil system and listen for leaks. It takes a while to push the oil out of the rails/etc., so don't get in a hurry If 110 psig air doesn't show a leak, then go to 150, or even 200 psig. You don't need more than that. Sometimes a small leak is hard to hear, that is why you do it with the valve covers off and the oil as hot as possible.

If you are convinced you have no leak, then it is either the IPR valve or the HPOP that is causing you to have low pressure when hot.

 

[gbb]

Removed driver side valve cover. Hear a gurgle from that bank. Sounds like lower in block.