7.3 PSD, Oil pressure drops with increased RPM.

[Bikersmurf]

New problem.
According to dash guage, has good oil pressure at idle. However, under throttle and increased RPMs it drops from 3/4 to about 1/3 of the way up. Engine runs fine and no noticeable difference in performance. Intermittently the 'water temp / oil' light lights up for a couple secs.

Had oil & filter changed, no difference.

It moves quickly and in sinc with transmission shifts.
No engine codes are showing.

I'm going to do the glow plugs in the near future, anything I should watch for when the valve covers are off?

Anything to check? Replace? Repair / rebuild?


My best guess from what I've read would be a leaking ORing around the injectors, leading to excessive oil use by HPOP. Should I just drive it? Thoughts?

 

[QCAuto]

First off verify with mechanical guage before anything else

 

[Mwilliamshs]

This^. Ford does a lot of things a lot better than they do gauges and besides that sending units, clusters, etc fail more often than oil pumps. A voltmeter at the oil pressure gauge terminals vs the sending unit can tell a lot.

 

[Bikersmurf]

I'll check it with a voltmeter when I've got a few minutes and report back.

 

[ujoint]

First off verify with mechanical guage before anything else

Yes.

 

[naterry]

The first thing I added to my van was redundant gauges for this reason. Maybe it's my bad luck, but every ford I've owned had flaky gauges.

 

[Bikersmurf]

Well, figured it out. Pulled of the lead to the sender and put it back on a few times.

No more pressure fluctuations on the guages. I was getting suspicious that everyone was correct about it being guage error because it was running so well. Sure enough it was.