Oil pressure failure

I have an Ford 150 4.2lts Mod 97 Every what I turn on does not show oil pressure in 5 O10 SEG the brand and sometimes go up the pressure, and I realize that the oil does not rise, because it starts sound

I recommend checking the oil strain as it can have a garbage or demisted carbon which reduces oil flow and therefore records you low pressure.

Friend Nesty first determine in which state the oil was in its last change and if the oil was not contaminated since it remembers that when the required change is not made, tars and varnisses accumulate and begin to cover the oil pipelines and therefore begin to sound I recommend that if this is the case, the engine adding a 200 milliliters of oil to the oil and leave it on by 5 min. And you change the oil before diagnosing or changing your oil pump or other motor components greetings

If it is hard to lift but finally raise the problem, if it is the pump the bad simply does not raise and now, check the oil first.

First of all, your oil filter changes, and you tell me what a result you got, to continue a diagnosis, remember to use the original