What I would first do is double check that the electric plug that goes onto the IPR
is clean and in good shape. There is an o ring in that plug so make sure it has not fallen inside the connection. Also check the harness wires that go into the IPR
plug, over time Iíve had the insulation degrade and short at that location. Also ensure the tin nut is snug on the rear of the IPR
At issue it appears you have low High Pressure oil, this can be caused by the electrical system (I.e., IPR
signal) and/or a leak some where in the HPO system, like an injector, failing HPOP
As you may know you need 500 psi
high pressure oil to injectors to fire the truck up. Youíve entrained air into the high pressure system through changing out the IPR
and itíll take a little while for it to work out of the system. Not surprising it may have taken an extended crank to fire up, especially if you didnít top up the HPOP
reservoir after IPR
change/cleanings. Was there debris on the IPR
Is the fuel filter media black, like saturated with diluted engine oil, this can be an indication that injector o-ring(s) have failed leaking HP oil.
If it were me Iíd double check the electrical system as noted above, because 168k seems somewhat low mileage for HPOP
or injectors (o rings) to be going out. Next I would probably purchase a few high pressure oil fittings, couple rail plugs, 3 ft of high pressure hose and a quality liquid gauge that reads to 4000 psi
. You can then isolate the high pressure oil pump, each high pressure oil rail to determine if you have a leak in the system. Do a search on here for greater details.
Let us know how you make out with the electrical connections.