Pump may be sucking air. I would remove the oil pan and check the pick up tube connection to the pump for bad oring or loose bolts.
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
SOURCE: where is the oil pressure switch on a 2001 f150
Left ( driver's side ) front of the engine on the 5.4L engine.
This is shown to be at the end of the baffled area of the intake, the edge of the pleated area farthest from the airfilter ( looking at the engine, the left side of the pleated folds ).
When you locate this, look down the front of the engine.
The connector is a black 1 pin connector with a White w/ Red Stripe wire to it.
You might have to remove the factory air intake plastic housing to see it.
SOURCE: oil pressure gauge light on until engine gets warm
oil pickup screen could be clogged, or your oil weight needs to be something different. for some reason your oil pressure is not correct until it warms up. First thing to do is run some engine flush through it.
Purchase and run some engine flush through the oil....make sure you buy a new filter and change the oil...
post back how it goes...there are some more things you can do but we should start off here first.
SOURCE: low oil presure
perform a master oil pressure test. this is done by removing the oil pressure sending unit and installing a oil pressure gauge. if the reading on the test gauge is ok, the sending unit needs to be replaced. if the pressure reads low on the test gauge, there may be excessive bearing wear or you may have worn valve guides. good luck!
SOURCE: 2000 Ford F-150. The oil temp warning light came
Make sure the oil level is correct. If the engine bearings are getting worn, the oil pump is worn or it's screen plugged, that can cause low-RPM weak oil pressure. Try running with 'high mileage' oil at your next oil change and always replace the filter. At some point, you may need to consider overhauling or replacing the engine. Good luck!
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Have you checked the connector to the oil pressure sensor ? Some times these can get dirt and oil in them, and stop working.
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