low oil pressure after highway driving - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-10-2011, 11:40 PM   #1
Newb
 
Join Date: Sep 2010
Posts: 11
low oil pressure after highway driving

Oil pressure gets really low after driving my Jeep at high speeds for a while. While on the highway it's right in the center of the gauge (40). When I get off the highway, it gets pretty low but not low enough to trigger 'Check Gauges' warning. However, if I shut it off after highway driving (ex: get gas) and then start it up, the pressure is extremely low and 'Check Gauges' comes on. It looks like it's going to go up for a few seconds but then falls back down. So I shut it off, wait about five minutes, fire it back up and it slowly creeps into normal range. Usually takes about 30 secs to get into normal range on the second go around. On about 2 or 3 occasions while driving around town, the pressure got up towards the upper spectrum of the gauge when stopped at a light but would then go back to the normal range when I started driving again. I change the oil about every 3k miles and the oil level has never been low. Any idea what might be causing this? I would guess the gauge is faulty, but wanted some other opinions. I never hear any odd sounds or anything like that. Thanks in advance.

cgd13 is offline   Quote Quick Reply
Old 03-11-2011, 02:25 AM   #2
Jeeper
 
Black98's Avatar
 
Join Date: Nov 2010
Location: South East PA
Posts: 379
I have noticed this same thing on my 98 4.0L with about 95k miles on it. After driving for a long time the oil pressure will lower to about 20-25 on idle. I really wish I also had an oil temp guage to verify if this directly scales with oil temp and not just engine temp. Im pretty sure this is a normal thing from the oil just thinning with heat but if anyone else would like to chime in it would be apreciated.

Black98 is offline   Quote Quick Reply
Old 03-11-2011, 08:57 AM   #3
Newb
 
Join Date: Jan 2011
Posts: 9
I've noticed this with my 2000 TJ as well. My pressure will actually drop to 9-10psi at idle after an interstate drive. I verified this with a manual gauge. I had originally suspected my 0331 head may be cracked causing coolant to get in the oil and causing rod, main, and cam bearing wear, but I do not seem to be loosing any coolant, at least not enough to measure. I don't have any ticks or knocks and I'd hate to replace the motor and this one be ok. Again, if anyone else has more experience, please chime in.
2broke2gofast is offline   Quote Quick Reply
Old 03-11-2011, 09:10 AM   #4
Jeeper
 
modrodr's Avatar
 
Join Date: Sep 2010
Posts: 119
Check to make sure the oil pressure sending unit located next to the oil filter is not bad. It is a common occurence that these get bumped during the oil change and damaged. It would be a cheap and easy replacemen as a precaution. Hope this helps.
modrodr is online now   Quote Quick Reply
Old 03-11-2011, 11:38 AM   #5
Supporting Member

WF Supporting Member
 
jeepers29's Avatar
 
Join Date: Feb 2011
Location: Georgetown, Texas
Posts: 3,000
Quote:
Originally Posted by 2broke2gofast View Post
I've noticed this with my 2000 TJ as well. My pressure will actually drop to 9-10psi at idle after an interstate drive. I verified this with a manual gauge. I had originally suspected my 0331 head may be cracked causing coolant to get in the oil and causing rod, main, and cam bearing wear, but I do not seem to be loosing any coolant, at least not enough to measure. I don't have any ticks or knocks and I'd hate to replace the motor and this one be ok. Again, if anyone else has more experience, please chime in.

I noticed this on my 98 as well. I called the mechanic the PO had been taking the jeep to for several years. The mechanic said this was very typical of this engine and not a problem. I do not have any ticks. knocks, ect. either. Any opinions would be appreciated.
jeepers29 is online now   Quote Quick Reply
Old 03-11-2011, 12:35 PM   #6
Jeeper
 
Join Date: Feb 2011
Location: Roseville, OH
Posts: 36
15-20psi at idle is normal.

Mine doesnt hit above 20psi once im up to temp.

As the heat int he engine build sup the bear gaps and extra get bigger, cuasing oil pressur eloss. It happens in every engine out there.
__________________
www. (my username) .com
offroadohio is offline   Quote Quick Reply
Old 03-13-2011, 02:49 PM   #7
Newb
 
Join Date: Mar 2011
Posts: 2
Is a common problem on tjs,,,, i think,I own a 97 and my brother a 99 and having the same problem,removing the instrument cluster and unscrew the lightbulb help me to stop looking at the evil Check Gauges warning light

vargassmooth is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

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.



Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
JK Rubi 2009 - First impressions (on road driving) gstoli JK General Discussion Forum 7 11-12-2009 02:08 PM
Low oil pressure at idle 97tjcse TJ Tech Forum 9 08-24-2009 11:12 PM
Fuel Pressure Problem? Rigerator YJ Tech Forum 7 05-18-2009 10:02 AM
Negligent driving 2nd degree ticket yj4x4 Off-Topic 16 11-04-2008 03:42 PM
Tire Pressure scotiez General Jeep Discussion 15 04-08-2008 06:35 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 09:06 AM.



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