No oil pressure unless at high rpm (oil light on)

[FordGirl2000XLT]

I'm stuck! I have a 2000xlt with a 5.4 in it. Yesterday out of nowhere the check oil light came on and the oil pressure bottomed out. I changed the oil and filter. Still had the same problem so I changed the sending unit... That didn't work either... The motor sounds good over all. Anyone have any ideas on what I might try next.

 

[stamp11127]

I'd check the pressure with a known good mechanical oil pressure gauge. If it shows low or no pressure your going to have a bad day if you don't shut it off quickly.

 

[Big Red Monster]

new oil pump? most logical thing I would change next in this situation

 

[tonydiv]

It can also be a clogged pick up screen.

I certainly wouldn't drive it until I verified the oil pressure as stated above.

 

[toms89]

Agree with all the above. Need to verify if you have oil pressure before you run it at all.

Zero oil pressure will seriously damage motor in short order.