I have a 2013 Maxxforce 466 that will have ICP desired at 2400psi or above and only have 435psi and has no power, Did a manual high oil pressure test and it is 5800psi, If you turn bus off and restart it will run fine for a few mins, then back to 425psi on ICP and IPR is requesting 82%
just had one doing sort of the same thing ended up oil filter (baldwin) changed oil and ICP is fine now, manual test is with everything hooked up or line to a gauge , if it is just a gauge check under valve cover for leak
OEM trained in wiring and all engine platforms for over 20 years
Thanks will try that, I saw your post did they change your pressure regulator also? The shop has also replaced pucks twice and all injectors and new ICP and IPR twice now, this is the time I get the bus to look at