2006 no start

[dhanna6powerstroke]

I have not seen this truck yet so bare with me. It's an 06 and had an HPOP leak at the branch tube. He replaced the HPOP and then pressure checked the system and could hear leaks under valve covers. Removed drivers side valve cover and found the stand pipe leaking. Replaced it and rechecked and the leak is gone on the drivers side. He still has a leak on the passenger side on cylinder #4 (if the passenger side is numbered 2,4,6,8). It leaks where the oil rail pushes down onto the injector. He has swapped injectors and it still leaks. He has taken the rail out and block everything off so he could pressurize it and it holds pressure. No matter what he does, it leaks between the injector and oil rail. What are the possibilities that the oil rail is bad causing the issue? Is there an o-ring that might have fallen out and not letting it seal? I'm going to go look at it tomorrow but want to me as informed as possible. Thanks for the info guys.

[sinner6.0L]

no o ring on the rail but there is a d ring and snap ring on the injector top that likes to go missing

it could still be the rail though, stranger things have happened. since you're already in there air testing try swapping rails side to side.

[dhanna6powerstroke]

Originally Posted by sinner6.0L

no o ring on the rail but there is a d ring and snap ring on the injector top that likes to go missing

it could still be the rail though, stranger things have happened. since you're already in there air testing try swapping rails side to side.

The ring is suppose to stay on the injector when pulled out? I think he already put the other side together but we can take it back apart if needed. Thanks for the info.

[dhanna6powerstroke]

Any other ideas? Gotta go look at this thing in the morning.

[dhanna6powerstroke]

Getting ready to go check this truck out in about an hour. Any more ideas?

[ajpu1983]

Have you checked the dummy plugs??

[dhanna6powerstroke]

Originally Posted by ajpu1983

Have you checked the dummy plugs??

He said they are ok but I'm going to check them when I get there. The weird thing is that it only leaks at cylinder #4 no matter what he does.

[ajpu1983]

Do you have a scanner you're taking with you? I would also pull IPR valve and check screen. By the way passenger side is 1,3,5, and 7.

[dhanna6powerstroke]

Originally Posted by ajpu1983

Do you have a scanner you're taking with you? I would also pull IPR valve and check screen. By the way passenger side is 1,3,5, and 7.

I knew I had that backwards He's got a scanner there at his shop. He's been monitoring ICP, not sure about IPR. What value should it be reading?

[ajpu1983]

If it is an ICP leak that's causing the no start then you should see IPR duty cycle around 85% and the ICP should be staying below 550 psi since it takes 550 to fire the injectors. I don't know how the initial diagnosis was done but never rule out a low pressure oil issue. If you have internet at his place write back when you hook up to the truck and let me know what it's doing. Did the truck die when it first went down or what was the initial problem before any repairs were done?