Question about Cars & Trucks
Had these same indications on a v8 range rover from new. Turned out to be a rotating main bearing shell opening the oil hole to the crank (low pressure) then closing off the hole ( high pressure). I would be having a mechanical oil gauge fitted ( service mechanic ) to eliminate any bearing fault. I would also be replacing the oil pressure sender unit. as a precaution
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
Posted on May 29, 2009
Intake gasket has nothing to do with oil pressure unless you have coolant in the oil. Several items in play here...You either have a poor connection at the pressure sending unit, the pressure sender wire is chafed and grounding, the sender itself is failing or the oil pickup screen on the pump is partially blocked with loose carbon debris. I'd replace the sending unit first as they are inexpensive. If the problem continues then do some testing. A mechanical gauge can be put in place of the sender. That will tell you what the actual pressure is. If actual pressure is normal and does not fluctuate as does the dash gauge, then the problem is in the wiring. If the mechanical gauge reads the same as the one on the dash, then the problem is inside the engine and will need some teardown to find the reason. If the pressure does not drop below 15-20 psi, you may want to add a quart of Marvel oil to the crankcase. Sometimes that will help dissolve internal deposits without causing further problems. (takes a few weeks though)
Posted on Apr 16, 2010
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