Question about 2003 Ford Expedition

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Low oil pressure - 2003 Ford Expedition

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  • Anonymous Oct 01, 2010

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Really only two possibilities if the vehicle is otherwise running properly. Either your oil pump is bad (likely a job for your favorite mechanic) or the oil pressure sending unit is failing (a simple replacement job). I suggest that you replace the sending unit and see if that cures the low pressure reading. You can pick up a new sending unit at just about any parts outlet, and they will likely have a diagram or photo showing the position of the unit in your vehicle.

Bill B

Posted on Oct 01, 2010

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When was the last time that you had Your Oil & Filter Changed ?
This would be my first step. BUT! It wouldn't hurt to take a sheet of cardboard or carpet Toss it on the ground and CHECK FOR OIL LEAKS .

Hope this helps: Please let me know how you make out

Posted on Oct 01, 2010

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Here is the procedure for testing for oil pressure, which lists the possible causes of the pressure light coming on.

The following can cause low or no oil pressure:
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2.Incorrect or malfunctioning oil pressure Switch -- replace the oil pressure switch.
3.Incorrect or malfunctioning oil pressure gauge -- replace the oil pressure gauge.
4.Improper oil viscosity or diluted oil Install oil of proper viscosity for expected temperature.Install new oil if it is diluted.
5.The oil pump is worn or dirty -- clean or replace the oil pump.

6.The oil filter is plugged -- replace the oil filter.

7.The oil pickup screen is loose or plugged -- replace the oil pickup screen.

8.A hole in the oil pickup tube -- replace the oil pickup tube.

9.Excessive bearing clearance -- replace the bearings.
Cracked, porous, or plugged oil galleries -- repair or replace the engine block.
10.The gallery plugs are missing or improperly installed -- install or repair as necessary.

11.The pressure regulator valve is stuck.Check the pressure regulator valve for sticking in the bore.Check the bore for scoring and burrs.
12.The camshaft is worn or poorly machined -- replace the camshaft.

13.Worn valve guides -- repair as needed.

If the vehicle has low oil pressure perform the following tests.
Check the oil level.
Raise the vehicle and remove the oil filter.

Start the engine and check the overall oil pressure, the oil pressure switch, and for noisy lifters.
The engine should be at operating temperature before checking the oil pressure. The oil pressure should be approximately 414 kPa (60 psi) at 1,850 RPM using 5W-30 engine oil.

If adequate oil pressure is indicated, check the oil pressure switch.

If a low reading is indicated, press the valve on the tester base to isolate the oil pump and/or its components from the lubricating system. An adequate reading at this time indicates a good pump and the previous low pressure was due to worn bearings, etc. A low reading while pressing the valve would indicate a faulty pump.

Without the tools to test the pressure, about all I might suggest is trying another oil filter brand, to see if you can get more pressure. It sounds like the sensor is working properly.Please let me know what you find out. Keep me posted and be glad to help you get your Montana running 100%. please rate. Oil pressure test kit J 25078-c is needed to test the oil pressure and can be loaned out in most auto parts store like Auto Zone or Parts Source.

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1 Answer

Low oil pressure light comes on and i changed the sensor

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Check your oil, it may be low if not the oil pressure needs checked. The sending switch could be bad or you have low oil pressure. If you have low oil pressure have it fixed ASAP. The loss of oil pressure can cause severe engine damage.

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If low oil pressure is verifiable the only repair is replacement of the oil pump assembly.

Start by verifying oil pressure with a mechanical oil pressure gauge. If oil pressure is low then replace oil pump.

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