Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum > Oil pressure

Join Wrangler Forum Today


Thread: Oil pressure Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-16-2013 08:40 AM
Neil F. Note early TJs have an actual pressure gauge that will show fluctuations. Later models have basically a dummy gauge that will show a constant "good" pressure as long as it is range. (I don't know what year the change was)
05-16-2013 08:17 AM
1979WagoneerLTD As above, verify your hot/cold/idle/2000 rpm pressures with a master gauge. Hot low idle can be in the 5-8 psi range, with 40 at high idle being acceptable.

Several things affect oil pressure: quality and type of lube, contamination, but mostly just engine wear. The seven main bearing six is very rigid on the big end, which gives it it's robust reputation. Despite that, like any engine, they can suffer bearing and journal wear resulting in lost or weak oil pressure.
05-16-2013 08:04 AM
yoopone
Quote:
Originally Posted by TJ56501 View Post
Mine is doing the same. Only mine drops WAY low and the light comes on. No ticks or nicks just low pressure???
I would check it with a mechanical gauge first them get a new sending unit if it checks out fine. My 97 did that and I got an OEM unit from the dealer and all was good again.
05-16-2013 07:30 AM
TJ56501 Yes it does, them slowly rises and falls a little but stays way low
05-16-2013 12:45 AM
Lando25
Quote:
Originally Posted by TJ56501 View Post
Mine is doing the same. Only mine drops WAY low and the light comes on. No ticks or nicks just low pressure???
Does it drop to zero when your at idle or at a stop light? Sounds like a failing sending unit to me.
05-16-2013 12:43 AM
Lando25
Quote:
Originally Posted by Redskins1613 View Post
Missed your other question... It will usually drop to the 40 sometimes just a tad below the 40
The oil pump is mechanically driven by the motor, meaning as you speed up your oil pressure will increase. As long as the pressure doesn't drop way below normal or zero not too much can happen.
05-16-2013 12:23 AM
TJ56501 Mine is doing the same. Only mine drops WAY low and the light comes on. No ticks or nicks just low pressure???
05-08-2013 06:44 PM
Redskins1613 Missed your other question... It will usually drop to the 40 sometimes just a tad below the 40
05-08-2013 06:43 PM
Redskins1613 It will start up between 40 and the hash mark after the 40... I usually put 10 w 30 in I have had a heavier oil in it till yesterday... The engine seems to be sounding fine when it's running but I do here a slight knock which I've had since I owned the jeep
05-08-2013 03:18 PM
icicle The oil pump works harder at higher RPM's, thus increasing flow and pressure. Oil pressure at idle will almost always be lower at idle than at cruising RPM's and is normal. How much below 40 does it drop? What viscosity oil?

Oil is thicker (higher viscosity) when it is cold, which results in higher pressures also, warmer oil flows easier and your pressure will drop accordingly.

It doesn't sound like you have an oil pressure problem at all, how low does it get?
05-08-2013 11:55 AM
Redskins1613
Oil pressure

Hi all.... I have a 98 jeep wrangler and I noticed yesterday that my oil pressure was low... It's usually a little passed 40... When I drive the pressure is good but when I come to a stop it drops below 40... Press the gas and start moving it rises again... I have some blow back on my engine (on the dip stick and in areas around there... Oil was low yesterday so I added a qt. started it up and oil pressure was good but as the jeep warmed up and I came to a stop it dropped again.... Any ideas?

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -5. The time now is 07:24 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC