Question about 1988 Ford F 150
The oil pressure drops off once the engine warms up. I have put in a new oil pump and pickup, tried various grades of oil (including fully synthetic), used Marvel Mystery Oil then changed the oil and filter. Once the pressure drops the engine will sometimes sound like the bottom end is rattling
Sounds like the main bearings are probably going.
Did you pull a couple of caps and look at the bearings when you had the pan off ?
It could be dirt in the passages but probably wear on the crankshaft.
As oil warms up it thins out and pressure is lost thru gaps in the bearings.
Posted on Sep 07, 2012
SOURCE: oil pressure keeps dropping?
You'll have to drop the oil pan and you will see your oil pump...Not much to replacing it either the hardest part is dropping the pan good luck and have fun wrenching...
Posted on Apr 25, 2010
Your Oil Pump is Out and will need to be Replaced. This is not a Job that you would want to attempt on your Own unless you have been a Mechanic. Trust Me. Been an ASE Certified Mechanic for 35 Years.
Posted on Jan 22, 2009
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
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If your oil pressure gets to low it can turn off the fuel pump. This may also have saved your engine. The ECM turns on the fuel thru the fuel pump relay for about 5 seconds. When engine is running oil pressure sender supplies the voltage to the pump. When engine shuts off check oil pressure and voltage to fuel pump.
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