Hello and welcome to Just Answer!
The boost pressure on these trucks will read atmospheric pressure, so it depends on your altitude! Typically they will read around the 14 psi.
What does your common rail pressure sensor read for psi when the engine is idling?
Is it within 500 psi of setpoint?
Have you replaced the fuel control actuator on the back of the injection pump?
Can you unplug the actuator and see if the engine starts and runs? It will run rough and get loud because the common rail pressure will be at maximum pressure.
Let me know,
It sounds like you have a faulty fuel control actuator. This controls the amount of fuel that gets to the injection pump. The setpoint pressure and the actual pressure should be within 500 psi of each other. The part # XXXXX XXXXX
I want you to download and read the info in this link. http://senduit.com/ca78b2
I would like to know if you have checked all the items in the test when the fuel pressure is fluctuating more than 500 psi.
The part retails for $300.00 cad.
I am not sure if you can purchase one from a diesel place yet, it wouldn't hurt to check!
If you checked the other items on the list, i would replace this and go from there!
I have seen them cause this before!
Ok Richard, I'm back at it. The link you had sent me says that the file has expired so I cant tell if I have done everything you want me to do. I do know that when I unplugged the actuator and the engine ran it ran different. a little noisier but no more fluctuation in idle and definately no dieing out. Then I plug it back in and idle is all over the place and dies. I assume that this actuator is the same as an IPR valve on most high pressure oil systems. I have had a few Internationals with similiar problems be that. Could you re-send link please?
Sorry about that! Here is the link again, it will expire in one day.
The file I sent is a PDF file and if you double click on the link it should open with Adobe. Let me know! You must have Adobe on your computer, it is a free program you can download.
I am still at work and will be off in 4-5 hours.
Thank you Richard. The actuator was the problem. Great job.
You are very welcome!!
Thank you for letting me know and I am happy to hear it worked!