You didn't specify which engine you have. So I listed available engines here - 4.3L and the 4.8,5.3,6.0L Gas motors have a minimum spec of 6psi at 1000rpm and 18psi at 2000rpm, and the 6.6L diesel has a 7psi idle and 28psi at 1800rpm. That being said - 20 psi is good. 20-40 is usually a good number at idle - it will move up the engine speed.
SOURCE: 2006 H2, 113K miles. DIC indicated Low Oil
Did you try changing the actual oil pressure gauge?
SOURCE: FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI
Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.
SOURCE: oil pressure gage
At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end?
If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)
SOURCE: diesel engine oil pressure 06 powerstroke 6.0
replace your oil pressure sensor and have a mechanic do a oil pressure test.
SOURCE: my chevy 1500 express passenger
The oil sending unit located on the top back of the engine is clogged. this will cause high readings.
You should replace it. Until you do it is OK to drive your vehicle. The part is $20 to$30. If you can remove the engine housing in the van, the sending unit will be staring you in the face. It is about 3" long and about 1&1/4 " in diameter at the base. And of course there is wire/wires going to it.
Randy
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