Oil pressure gauge squirrely

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dieselenthusiast

NAXJA Forum User

Location

Zuni Mountains, New Mexico

• May 18, 2014

• #1

I have a 2000 XJ with 185,000 miles. At idle, the gauge reads 29. When driving 55 mph, the gauge reads 60. Either my gauge is faulty, or the sending unit is faulty, or my oil pump is going bad. Any thoughts?

 

Tim_MN

Freakish Hand Strength

NAXJA Member

Location

Minneapolis, MN

• May 18, 2014

• #2

Since 4.0L sending unit failure is common, and the sending unit is the cheapest and easiest part to replace, a new sending unit is the logical solution. As suggested in most of the previous wonky oil pressure threads, you can always test the actual oil pressure with a mechanical gage.

 

Last edited: May 18, 2014

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cpefy3

NAXJA Forum User

Location

Virgin Islands

• May 18, 2014

• #3

As with other sensors, if you end up replacing the sending unit; do so with only a mopar unit. You will be happy you did. :thumb up:

 

old_man

NAXJA Forum User

Location

Loveland, Colorado

• May 18, 2014

• #4

dieselenthusiast said:

I have a 2000 XJ with 185,000 miles. At idle, the gauge reads 29. When driving 55 mph, the gauge reads 60. Either my gauge is faulty, or the sending unit is faulty, or my oil pump is going bad. Any thoughts?

Click to expand...

The readings you are getting are absolutely fine. The pressure varies with rpms and yours look typical.

 

XJEEPER

NAXJA Member # 13

NAXJA Member

Location

Wasatch Range

• May 18, 2014

• #5

Almost identical mileage on my 2000 XJ, same oil PSI too. Perfectly normal. If you had 25 psi at 55, that would be a concern.

 

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dieselenthusiast

NAXJA Forum User

Location

Zuni Mountains, New Mexico

• May 18, 2014

• #6

Thanks Old_Man and XJEEPER. I guess I had not noticed that before. I thought that the oil pressure seemed low at idle and high at cruising speeds! If you think it appears normal, then I wont worry about it! Thanks for the clarification!