XJ Oil Pressure?

[sprngfldxj]

Oil Pressure fluctuates radically when the accelarator is pressed down. In Gear or Out.
This began after I changed the Oil? Any Relationship?
Could it be the oil pressure sending unit or the gauge?

[XgeekstarX]

it happens when the oil gets hot. after driving on the interstate for a while and i come to a stop i'll be at around 25psi, but as sooon as i start driving it goes up to 60.

[old_man]

This is normal. You should have a minimum of 13psi at an idle and IIRC 33psi at highway speed.

[RichP]

Filter brand, if you answer "Fram" change the filter to a better brand.
Check the sender, you might have knocked when changing the filter, it is right above it...

[floyd]

A tangent:

On our way back from Chicago last weekend I noticed the oil pressure was running about 10psi *higher* than normal at both highway speeds and idle. My first thought was something may be restricting the flow and therefore increasing the pressure. Thoughts? Comments? Suggestions?

[fdsa487]

Filter brand, if you answer "Fram" change the filter to a better brand.
Check the sender, you might have knocked when changing the filter, it is right above it...

What is wrong with Fram?

[sprngfldxj]

Well guys,
The way it has been acting, it has been 40 at idle and way above 80 at speed!
I have heard that it is the sending unit, I am checking into that.
I did use a fram, but I will see if there is better.
Any suggestions?

[Jonnyjpr]

mine is the same way with yours sprngflxj. i've replaced the senser cause i wasnt working before. And now with the new senser it works only when it wants to.

[Kurt04]

Are these prone to going out? Mine hasn't worked since I got it. It floats around 40 sometimes, then it will just layover for a little bit, then come back. :dunno:

[sprngfldxj]

I'm wondering if it is the fact that it may have moisture in the terminals?

[Kurt04]

I'm wondering if it is the fact that it may have moisture in the terminals?
:dunno: The rest of my guages seem to work fine.

[UNCC_99XJ]

What is wrong with Fram?

Search "fram" on the site and you'll have a lifetime supply of posts to read through about how bad they are...i've seen what they do...old boss had one on his 98 XJ that I did some work on for him. When I went to pick it up to work on it he said "my oil pressure seems a little low lately...i just changed the oil and it's got the right ammount, see if you can find anything." Didn't even have to open the hood, all I asked was "fram filter?" he replied with...."well....yes." I advised him to spend a couple dollars more and get a napa gold, and it's like magic, oil pressure is right back up again to where it should be.

As for the guage moving, that's what it's supposed to do. obviously you're going to have higher pressure when the engine oil is cold than when it's hot. On my 4.0, once it's been running a while (say after i get off the highway for a bit or after running around town for a while) my oil pressure is about 19-20 at idle and up right around 40-45 while cruising. Completely normal.

[2000xj4x4]

mine never moves its just lays on 80 all day long. weather the ignition is on or off.
sender maybe??

[rparker762]

:confused: I got into mine this morning and the pressure jumped up to 80. I took off it came down slightly. Normal since I got it Sunday has been 55 to 60 at speed and 60 when its cold, and drops to 40 after freeway driving. Anyways I watched it jump between 60 and 80 a few times. While I was driving this morning, the pressure would drop to 60 and when I would come to a stop it would rise again.:dunno: This is my first Jeep so I don't know what to expect.... It has a 4.0 HO

[Nevada City Sparky]

So question: On a freshly rebuilt engine with new oil pump and sender, what should oil pressure be?

Our's is hitting 60 PSI at idle, before any driving (still doing final assy and troubleshooting).

[JeepFreak91]

mine constantly stayed at 40 psi then i unplugged the wires to the sender and used dielectric grease and put it back and now it fluctuates with engine speed after it gets hot.

[Blaine B.]

After changing oil I do notice the sender is strange sometimes, weather I bump it or not.

[floyd]

Hmm, I'll have to do some searching to see what the supposed gripe is with Fram. I've built many engines, had many cars, am a former ASE certified mechanic, and have *never* experienced problems using Fram filters. Take apart a Fram, AC, Motorcraft, Napa, you'll find very little difference between any of them. If your pressure is going down when you use Fram, it's because it is filtering better!

[fdsa487]

Hmm, I'll have to do some searching to see what the supposed gripe is with Fram. I've built many engines, had many cars, am a former ASE certified mechanic, and have *never* experienced problems using Fram filters. Take apart a Fram, AC, Motorcraft, Napa, you'll find very little difference between any of them. If your pressure is going down when you use Fram, it's because it is filtering better!

Post up what you find out!

[Starscream]

This is normal. You should have a minimum of 13psi at an idle and IIRC 33psi at highway speed.
33psi at highway speeds? At idle mine sits around 25 (once it's run for a bit), but if I'm on the throttle (including cruise on the highway) it stays right around 50-55. This is with a mechanical oil guage, too. Normal or no?

[1985xjlaredo]

my 85 2.8L I s all over the place like 35-80 cold or hott. New Everything on this one so unless it never worked it working ok now. My 88 stays right at 21 no matter what I do. WIX filters are the absolute hands down best filter there is.
Does anyone know the part # for the oversize filter that comes off of a mustang 5.0?

[floyd]

WIX filters are the absolute hands down best filter there is.

As long as you don't get your hands on one of their filters that are made in China!

[1985xjlaredo]

hmm I havent noticed that they are made in China but I also never thoght to look thanx for the heads up!
Anyone ever put a magnet on the top of the filter to keep the metal up in it? does it work?