89 XJ Oil Pressure?

S

sleeperjeeper

NAXJA Forum User

Location

South Lake Tahoe, CA

• Mar 21, 2008

• #1

I have an 89 XJ with a 4.0. My Oil Pressure gauge says that I run at 20 lbs of pressure while idling and the same when driving/accelerating. Is that normal? Could the sensor be bad, or is my oil pump going out? What does a normal XJ run at?

Thanks

 

wolfpackjeeper

NAXJA Forum User

Location

500' and 500KCAS, RAF lakenheath

• Mar 21, 2008

• #2

could be time to change the oil

 

S

sleeperjeeper

NAXJA Forum User

Location

South Lake Tahoe, CA

• Mar 21, 2008

• #3

wolfpackjeeper said:

could be time to change the oil

Click to expand...

That too, but I don't think thats it. I've owned the jeep a couple years and it has always been the same.

 

M

Maz

NAXJA Forum User

Location

LaCanada, CA

• Mar 21, 2008

• #4

sleeperjeeper said:

What does a normal XJ run at?Thanks

Click to expand...

Well that's hard to say, but for your reference, the oil pressure readings on my 89, running 10-30W oil are:

58 psi = cold idle
25 psi = hot idle
60 psi = cruising at 65 mph

I have no clue on the accuracy of the gauge.

 

J

Jess

NAXJA Forum User

Location

Tennessee

• Mar 21, 2008

• #5

sounds like you need a new sending unit. If you don't hear any valve chatter, your pressure is fine.

 

Ecomike

NAXJA# 2091

NAXJA Member

Location

MilkyWay Galaxy

• Mar 21, 2008

• #6

Could be a plugged filter, or stuck anti drain back valve or stuck oil pressure relieve valve or the common item, a bad sensding unit.

I would change the oil filter and oil, and then the sending unit, in that order immediately.

 

rockwerks

NAXJA Forum User

Location

Chito Beach Resort, WA

• Mar 21, 2008

• #7

Mine is jsut the opposite 60 at idle and 80 on the road WHOA!:wow:

 

S

sleeperjeeper

NAXJA Forum User

Location

South Lake Tahoe, CA

• Mar 21, 2008

• #8

Jess said:

sounds like you need a new sending unit. If you don't hear any valve chatter, your pressure is fine.

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I think I do get a little chatter. By sending unit, do you mean the oil pump? Sorry for my ignorance, but I have delved very little into this type of stuff. I assume it is inside the oil pan?

 

S

sleeperjeeper

NAXJA Forum User

Location

South Lake Tahoe, CA

• Mar 21, 2008

• #9

sleeperjeeper said:

I think I do get a little chatter. By sending unit, do you mean the oil pump? Sorry for my ignorance, but I have delved very little into this type of stuff. I assume it is inside the oil pan?

Click to expand...

Nevermind, I figured it out where it is at. is there an easy way to test it, or should I just replace it and go from there?

 

Ecomike

NAXJA# 2091

NAXJA Member

Location

MilkyWay Galaxy

• Mar 21, 2008

• #10

They go bad on a regular basis it seems, possibly due to physical damage from oil filter installs that bump them too hard.

Just check the wire connector on the sensor, make sure it is clean and fits tight when it spaps on. If that does not fix the reading then the sensor is bad, or you have some other problem like I listed earlier.