help, oil pressure at idle = 75psi

[NIGHTfall_240sx]

before it always was at 25psi.... it just started happening today... any ideas what coudl be the cause?

[llamabeta]

Clog in the galley somewhere? Malfunctioning pump or sensor.

[NIGHTfall_240sx]

hmm.. it seems it went down when i let it sit there for awhile, the idle rpm was at around 1100 too, that dropped a lil and so did the oil pressure.. imma go drive it around gently for a few and see if warning her up helps

[NIGHTfall_240sx]

hm.. i drove around and after i was done, parked back in the driveway and it was around 27psi (lil over 25 on the needle) so imma just assume it was because engine was cold.... but thing is im in Florida (conditions are not that cold) and i never seen it do that any other day.. hmmm

[DAEDALUS]

It's always way higher before warming up. Cold oil is thicker than hot oil

[BaliLover]

I ran 75psi at cold idle and I'm in FL. THis was on a redtop SR20DET read from an Autometer electric gauge. When warmed up the pressure is around 25-30psi. At 60mph in 5th it sits around 60psi.

[Aries]

it was probably a little bit of bearing lube that worked its way into the oil galley. It happens from time to time, even on older motors. If the oil pressure gets up there like that, and stays there, then you have a spun bearing.

[Nismo_Freak]

it was probably a little bit of bearing lube that worked its way into the oil galley. It happens from time to time, even on older motors. If the oil pressure gets up there like that, and stays there, then you have a spun bearing.

Bearing lube?

The bearings are lubricated with the engine oil... the only time they have something else lubricating them is when you use an assembly lube after a rebuild. Assembly lube isn't dense enough to block an oil passage, and shouldn't be present in the engine. Nor will a spun bearing cause the oil pressure to suddenly rise 80 psi.

I don't think it's an issue until it starts to reproduce itself. Remember that cold start-up oil pressure is often above 100 psi for thicker oils, and it takes a good solid 5-10 minutes of driving to warm up the oil.

You might also want to change your oil and oil filter if you are still driving within a 1000 mile mark of getting the engine started. Used engines tend to have a bunch of gunk built up in them.