First off, the drop in IPR% means nothing since the ECM is working off of an inferred ICP value and the IPR duty cycle is a commanded value, not actual....so it's not telling you squat about if the valve is working or not....just that the valve is being told not to open as far since the fake ICP value is higher. To check this properly, you've gotta watch the trends and see if HPO pressure rises when the valve is commanded differently.....if your tool can do that.I understand what you’re saying. And I agree that I have been cranking this engine much longer that it should’ve taken, but there is zero run time on this engine.
with the icp sensor in, 1.5psi, ipr at 85%.
icp sensor out, or unplugged, 953psi, ipr at 42% I think? I think the valve is working.
I honestly think there’s a ton of air trapped within the system.
Your choice to keep cranking, but AT MOST....if everything was as it should be, should only take about 15 minutes of cranking to get enough oil through the system to get it to spit/sputter and start trying to fire...yes even on a completely dry system. IMO somethings wrong. Gonna be counterintuitive to what you've been doing, but I'd start with checking the IPR screen like suggested and do an air test while you're there to check for leaks on the HPO side. If that passes, move to the LPO side and check for volume/pressure. Pop the LPO regulator out of the housing and make sure it's not sticking/stuck and the spring is in good shape.
You said you "rebuilt" it....what exactly was entailed in the rebuild? People use the same words, but they often have different meanings/interpretations. Knowing exactly what you did/what areas you were in can help us point to other things to check.