Low Oil Pressure

[JP13]

2005 4.0

Random low oil pressure.
Check gauges light comes on.
No check engine light.

What could be the problem?

 

[TJ4Jim]

One of the best ways to confirm your pressure is to remove the oil pressure sensor and install a pressure gauge. I believe the sensor is 1/8 NPT. If you find the sensor is bad stick with the OEM Mopar sensor as the aftermarket sensors are prone to failure.

 

[Jerry Bransford]

2005 4.0

Random low oil pressure.
Check gauges light comes on.
No check engine light.

What could be the problem?

The sender causes that problem enough that I would just replace it with a new Mopar sender (no store brands) and not bother installing an aftermarket gauge first.

 

[JP13]

I'll pass on adding another gauge. I want the OEM to work correctly. I'll replace the sensor. Thanks.

 

[JP13]

Is this the correct part?

http://www.morris4x4center.com/mopar-oil-pressure-sending-unit-5149064aa-m.html

 

[JP13]

Mopar Engine Oil Pressure Sender Switch https://www.amazon.com/dp/B00CHUNJOU/?tag=wranglerorg-20

 

[TJ4Jim]

I'll pass on adding another gauge. I want the OEM to work correctly. I'll replace the sensor. Thanks.

The point was to install a gauge temporarily just to confirm it's not a pressure problem, not on a permanent basis.

 

[Chris]

Mopar Engine Oil Pressure Sender Switch https://www.amazon.com/dp/B00CHUNJOU/?tag=wranglerorg-20

That's the correct part.

I don't think it's actually low oil pressure, I'll bet it's the switch acting up. It seems to be fairly common on these TJs. Not to mention the factory oil gauge isn't really known to be all that accurate as well.

 

[JP13]

The point was to install a gauge temporarily just to confirm it's not a pressure problem, not on a permanent basis.

Thanks, but I think the money spent on a temp gauge would be better spent on replacing a sensor since my LJ has high mileage.

 

[JP13]

That's my 7th Jeep related Amazon order this week. Lol

 

[Lukefoster]

I have the same issue. However, I replaced the sending unit and the Jeep continues to suddenly show a drop to 0 in the oil pressure, then immediately rises to normal pressure. I have a 2003 TJ with the 4.0. Any help would be appreciated.

 

[bromel]

I have the same issue. However, I replaced the sending unit and the Jeep continues to suddenly show a drop to 0 in the oil pressure, then immediately rises to normal pressure. I have a 2003 TJ with the 4.0. Any help would be appreciated.

Did you replace with a Mopar sender? The aftermarket ones are junk. Otherwise, buy a mechanical gauge to check your actual oil pressure.

 

[Coachgeo]

One of the best ways to confirm your pressure is to remove the oil pressure sensor and install a pressure gauge. I believe the sensor is 1/8 NPT. If you find the sensor is bad stick with the OEM Mopar sensor as the aftermarket sensors are prone to failure.

can anyone verify the 1/8 NPT

 

[TJ4Jim]

can anyone verify the 1/8 NPT

Yeah it's 1/8"