Oil pressure question

[doehunter]

I have a 2000 Expedition with the 5.4 V8. About 120K miles.
Lately I've noticed a few times that the oil pressure doesn't come up when I start the engine.
1st let me say, I don't think it's actually a gage. Its the stock indicator in my dash that LOOKS like a gage. Maybe it's just a pressure switch?

The oil level is fine. (it's a little dark and probably needs changing)
If I increase RPM's, the pressure comes right up, and then goes all the way back down when I get off the gas. After it warms up, everything is normal.
The engine doesn't make any unusual noises. Runs fine.
I'm afraid this might be a sign of bad things coming?
What do you think?

 

[doehunter]

After searching, I see someone with similar symptoms saying it's the oil pressure switch.
I guess I'll change it out this weekend, when I change the oil.
Next up is the check engine light is on, codes said something about pcv/ egr, valve or hose or something.

 

[Big White]

Probably the switch.
For the codes, check the rubber elbow on the back of the throttle body that goes to the PCV valve. The elbows are notorious for failing.

 

[gschwoyer]

Sounds like the switch. I just had the same problem with my 2000 5.4. Switch was about $10 or so at Advance Auto. It's located next to your oil filter. I found it easiest to get to it from underneath. Go just behind the front diff. and look up towards your filter. I used a long needle nose pliers to get the plug off. Have an extension or two, a universal and a 1-1/16" (IIRC) deep socket handy. Pretty easy job.

 

[alaskanexpy]

switch.

same problem with my '91 f-250. we installed a real pressure gauge to be 100% sure.

 

[splintrcel]

Its for sure the oil sending unit or switch. I had my gauge do the same thing. It will flip from normal to 0 pressure like 5 times before it stabalized. Its like a $15 part. Its located under the block above the front axle(4x4). I believe its toward the driver side. Its a small ass gap to get in there. I used a deep socket with a universal joint and two extenders. Oil will dump out when u remove it so be ready. Its not alot though so dont worry. You prob wont have to add any.