It was a couple of days ago when the oil pressure went to 0 psi and then went to the normal position,and it stayed like that for too days,at the present time everything is normal, i checked the oil level it,s ok, no oil leaks,oil sender unit seems ok it,s not leaking, I,m assuming it might be in the oil pressure relief valve, i have a 4.7 V8 and i see that there is alot of people having the same problum, and the temp that day wes at -20 for a three days, i,m thing that the pressure relief valve was sticking, is this possible. Paul
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it appears that the pump pressure relief valve is stuck and is not sealing off the oil system to allow pressure to build up at idle. It may be necessary to remove the oil pump and pressure relief valve for checks /repairs.
Check the pressure sending unit. If that is okay, you will need to use an actual oil pressure guage to determine that the pressure is okay. I believe it should be around 40 PSI, at a high idle (You can find actual specs in a repair manual). Some possible problems are worn oil pump, weak pressure relief valve, or something restricting oil flow. I hope this helps.
I would want to know what the actual oil pressure is. The sending unit or the gauge on the dash could have failed.
There is a pressure relief valve to prevent oil pressure from going too high, but staying at 80psi would not be good for a long time.
Normal oil pressure should be between 40 and 60 psi. A cold engine will normally have higher pressure. If you're seeing 75 psi on a warm engine I would recommend having the pressure checked with a manual gauge to verify the gauge in the Jeep is working correctly. If the gauge is correct oil viscosity may be too high (oil too thick) or there may be a problem with the oil pump pressure relief valve. If the gauge is not correct the sending unit may be at fault.
The oil pressure should be 60 to 65 psi when engine started cold and at operating temperature should be 40 to 50 PSI at idle and 45 to 60 at higher RPM's with engine at operating temperature. Low pressure could be a faulty oil pressure sending unit or a bad oil pressure regulator valve. Good luck and hope this helps, and you could always have your oil pressure check manually to ensure a correct pressure reading. If you think it could be the
oil pressure relief valve (Sometimes) or the check valve (not very
often). One is located inside the oil pump and the other in the adapter
on the motor that the filter screws on to. If you also have a problem
with the oil pressure being erratic when the motor has been running I
would be looking at the valves.
Sounds like the pump pressure relief is gummed up or faulty. Try putting in a quart of marvel oil. If it does not get better in a couple of days, you may need to take the pump out and check it. Depending upon what engine you have, some have the pump located in the timing case cover...on those it maybe possible to remove and clean the relief. Get a manual and check to see where yours is located. Avoid high rpm running while you have this problem as your oil filter can split open and you will quickly loose your engine oil.
it sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30