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Unread 01-26-2014, 09:06 PM   #1
JTWM0677
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1994 ZJ 
 
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Location: Carthage, NC
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Erratic oil pressure

Until today, my oil pressure when driving has been a constant 65-70 on the gauge in the dash, but today, it's been quite erratic. Hovering just above 40-45.. Is something clogged, or am I looking at a costly problem beginning to rear it's ugly head? If so, what am I looking at? I'm approximately 2 weeks away from a routine oil and filter change.. I'm hoping that will solve the problem.. Oh yeah, checked the oil, and the level is fine.. Not low or over-full. Thanks in advance everybody.

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Unread 01-26-2014, 09:10 PM   #2
PolkaPower
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Could be a misbehaving oil pressure sender.
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Unread 01-26-2014, 09:13 PM   #3
JTWM0677
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Quote:
Originally Posted by PolkaPower
Could be a misbehaving oil pressure sender.
How difficult to replace?

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Unread 01-27-2014, 08:27 AM   #4
pageman
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It sucks its right by the distributor. If your going to replace it you might as well repair any plenum gasket cause most leak a little with there age then mabye do a kegger mod and while thats all off replace the distributor and wires while in there
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Unread 01-27-2014, 08:35 AM   #5
PolkaPower
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Quote:
Originally Posted by pageman View Post
It sucks its right by the distributor. If your going to replace it you might as well repair any plenum gasket cause most leak a little with there age then mabye do a kegger mod and while thats all off replace the distributor and wires while in there
How do you know what motor he has?
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Unread 01-27-2014, 09:48 AM   #6
JTWM0677
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Quote:
Originally Posted by PolkaPower
How do you know what motor he has?
Inline 6

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Unread 01-27-2014, 10:46 AM   #7
johns1mj
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Oil pressure sender is right above the oil filter. I have broke several when the oil filter wrench slips. It is an easy switch to change. The switch should be less then $50. If you do not have a wet gauge just change the switch. If this doesn't fix the problem you may have other issues.

My oil filter adapter was leaking and it changed my oil pressure when I fixed it.
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Unread 01-27-2014, 12:51 PM   #8
pageman
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Omg sorry i assumed a v8(iv had v8 on my mind all day, iv been working on 2 v8's) if its the 4.0 i have no clue
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Unread 01-27-2014, 01:01 PM   #9
JTWM0677
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Quote:
Originally Posted by pageman
Omg sorry i assumed a v8(iv had v8 on my mind all day, iv been working on 2 v8's) if its the 4.0 i have no clue
Yup.. 4.0.. 249,750 miles and still strong.. Wanna keep it that way.. Lol

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Unread 01-27-2014, 01:24 PM   #10
JasonStebbins
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Quote:
Originally Posted by JTWM0677 View Post
Yup.. 4.0.. 249,750 miles and still strong.. Wanna keep it that way.. Lol

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Takes two minutes to replace on the 4.0L. Broke mine once pulling the filter out. Just screws in.

You've almost joined the quarter million mile club.

40-45 is where mine hangs out once warmed up. 35 while idling. 55ish on the first start of a cold winter day.
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Unread 01-27-2014, 06:46 PM   #11
pageman
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Mine idles at 40 psi warm and runs at the thick 3/4 needle while driving but again im a v8
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Unread 01-28-2014, 08:18 AM   #12
herqulees
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I would be seriously worried if my Jeep with 4.0 ever said 65-70psi for oil. Mine stays between 35-45psi.
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Unread 01-28-2014, 08:32 AM   #13
JTWM0677
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Quote:
Originally Posted by herqulees
I would be seriously worried if my Jeep with 4.0 ever said 65-70psi for oil. Mine stays between 35-45psi.
Manual says between 40-70 during normal operation, and he only time it falls below 40 is while stopped and in gear, the it only drops to 35.. Point of the post is, until the other day, it sat at a constant 70 while driving, and 40 while stopped in gear, and I want to make sure I don't have a major issue, especially with our area expecting 8" of snow today..

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Unread 01-28-2014, 08:59 AM   #14
Purcell69
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I would suspect the pressure sending unit as well. If the oil looks good and there are no changes in either the sound of the engine or the way it runs, there is no reason to worry. It could be something as simple as poor contact at the plug due to contamination, since just about every 4.0 leaks oil at the filter adapter.

-Joe
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Unread 01-28-2014, 09:00 AM   #15
herqulees
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Quote:
Originally Posted by JTWM0677 View Post
Manual says between 40-70 during normal operation, and he only time it falls below 40 is while stopped and in gear, the it only drops to 35.. Point of the post is, until the other day, it sat at a constant 70 while driving, and 40 while stopped in gear, and I want to make sure I don't have a major issue, especially with our area expecting 8" of snow today..

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Well if I remember correctly there are two different sensors for oil pressure, one for the oil gauge, and one for the low oil pressure warning light. If the light isn't on and your gauge is just acting weird which is common along with the engine still sounds the same I'd say all is good.
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