Is my oil pump going bad or is it the sensor?

2000 Mercury Mountaineer (Ford Explorer)
302
Auto

Yesterday the oil pressure needle started going crazy and the dash light came on we stopped at the nearest gas station and turned the car off. Waited about 15 min. Started it back up and everything was fine, checked the oil added added some drove all day, everything fine and then it started acting up again. Any thoughts?

__________________
For the Saved, this world is the worst it will ever get.
For the unSaved, this world is the best it will ever get.

Clk's Ebay Stuff BUY SOMETHING NOW!!!

Light it on fire and start filming.

__________________
1961 220b: first project car - sold.
2000 CLK 430: first modern Benz - sold.
2001 CLK 55: OMG the torque!!! - sold
1972 280SE 4.5: Baby Gustav
1991 300TE 4Matic: Gretel the Snow Bunny - sold
1978 300SD: Katz the Free Man - given away
1980 Redhead: Darling Wife

It's the only car I have and it only has liability on it.

__________________
For the Saved, this world is the worst it will ever get.
For the unSaved, this world is the best it will ever get.

Clk's Ebay Stuff BUY SOMETHING NOW!!!

Probably just an instrument cluster issue. Is the engine making any unusual noises when you see it happen?

__________________
Jim

Oh, well then you should definitely change the policy first.

__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

The needle on the oil pressure gage goes crazy and then flat lines and then the check gages light comes on. then when I press the gas pedal, the harder I press, the higher the needle goes and the everything is normal.

__________________
For the Saved, this world is the worst it will ever get.
For the unSaved, this world is the best it will ever get.

Clk's Ebay Stuff BUY SOMETHING NOW!!!

My money's on a cluster issue, then -- it's hard to picture the oil pressure jumping around like that.

__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

I'd clean the connection on the sensor first....and look for a loose wire.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Now that I think about it, the F-150 I use to own would do the same thing when it would get around freezing outside.

__________________
For the Saved, this world is the worst it will ever get.
For the unSaved, this world is the best it will ever get.

Clk's Ebay Stuff BUY SOMETHING NOW!!!

An oil pressure sending unit for that rig is $20. Change it, and go from there. We stock several. Just do it. OEM motocraft one is $20, an aftermarket one is $12.

Make sure to specify that it has a gauge, not just a light, they are different.

~Nate

__________________
95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)

I thought that Found on Road Deads had a fake gauge that read 3/4 scale when there was pressure and zero with no pressure, with the sender being an oil pressure light switch.

If that's the case, I'm betting on the gauge itself...

__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

IIRC, it is 3-5 psi that will make it read a little over half. That kinda makes me wonder. Is the pressure fluctuating and low? I would hook a mechanical gauge up to it to see what it is doing. After that, chase grounds.

__________________
01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow