VLOM, High oil pressure

[KevinRum]

No, the oil pump was the start of my issues as I was getting a faulty oil pump message before any lifters blew.  Despite showing the 2-stage oil pump error, I was seeing high pressure albeit somewhere a little past 80psi and low side was about 17psi at idle and warm.  It did not seem the "span" of the truck gauge was inaccurate since I was extreme on both ends and the new gauge read the same.  When the mechanic put a master gauge in-line he supposedly saw pressures all over the place and determined the pump needed replacement.  Interesting fact is the pump error would almost always pop up while cruising down the highway at 40psi, which is technically when the VLOM is supposed to activate!  It never popped up at idle when the pressure was low.   After replacing the pump, the pressure increased a few psi on the low end and would spike way past 80+.  The gauge would hit 80psi hard and quick which is why I think they were around 100psi since the gauge does not go that high.  Hind site, I think the VLOM was my main issue and the pump still had some life in it.

 

Also note before the oil pump was replaced, I could keep the pressure at or slightly below the 80psi mark depending on the rate I applied load when the truck was hot.  When it was not fully hot, it was almost a guarantee it would exceed 80psi at 3500rpm, so there were times I too could keep below the 80psi mark.

 

If I were you I would change the VLOM and then go from there.