2004 f150 runs fine two minutes ..then no oil 5.4

check oil level ---yes it can but tapping noise can be a lot more reasons --worn oil -low oil pressure--low oil level--rocker loose-worn or damaged lifter-worn damaged valves --timing chain --water pump--pulley --really anything can cause a tapping noise --try to isolate the area or sound and diagnose problem

Check the oil pressure manually with a gauge. Make sure you have oil pressure. Perhaps you need a new oil pump, or new lifters. Get a professional opinion from a non interested party. Save money, get a diagnosis.

take it back now!

sounds like the pcv valve is bad in valve cover. if the pcv valve is bad it will create a pressure in crankcase and oil has to come out some where. check all gaskets. the pcv valve is under 10 dollars, and only about 5 minutes to change.

Start by verifying the oil pressure sending unit. It is quite common for a bad sensor to act erratically, such as you have described. Acquire an oil pressure gauge and install it in an appropriate location, perhaps in place of the oil sending unit if a more convenient location is not available, and run the engine. Observe the pressure on the test gauge at various RPM and over a period of several minutes as the engine warms. If pressure on the gauge is good, then you have a problem either with the oil pressure sending unit, in the circuitry, or instrument panel gauge. However, the problem is most likely the sending unit. Note: the sending unit often requires a special socket, which may be obtained at any auto parts store. Also, if you don't own a test gauge or unwilling to purchase, many auto parts stores now rent tools, others even loan tools provided an adequate security deposit is made.

Remove the oil pan and replace the oil pump.

Jim, I think your oil pressure sender is going bad, you should replace it and see that your oil pressure is in fact good, you can also check and verify the wires to it at the same time. It is located next to the oil filter. Hope this helps, let me know

oil pump, if it has never been replaced, its time already, also check seals inside the engine and gaskets

This might be as simple as an oil filter draining down and delaying oil pressure during cold starts.Recomend usage of Nissan factory filters as theirs has a built in check valve to minimize bleed down.Also recomend oil no thicker than 5W30. You may be also faced with a hydralic lash adjuster bleeding down causing momentarily loose clearance in the valve rocker assembly. This particular ratlle would be half of crankshaft speed which would indicate upper end rattle.

CHECK THE TIMING