Oil pressure affecting blood pressure! - Jeep Wrangler Forum
Jeep Wrangler Forum

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

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-14-2011, 08:50 PM   #1
Newb
 
Jb8s's Avatar
 
Join Date: Dec 2011
Posts: 3
Oil pressure affecting blood pressure!

I have a 2000 wrangler, 4.0 inline 6. A couple of weeks ago I parked at work and the check engine light came on. The oil pressure had bottomed out. Rev'd the engine and it went back to around 20lbs. This continued fir the next week or so every time I stopped at a red light or parked. I changed the sending unit thinking that would do the trick, but still had the same problem. Today I checked the pressure with a manual gage and it was in fact losing pressure at idle.(hoping I just had a bad dash gage) I was told that Chrysler had, in the past, put a coating on the inside of the oil pan and that it has been known to flake off and cause problems, but seems to me like if that was the case, it wouldn't gain pressure when the engines rpm's were increased! Anyone else experienced this issue?

Jb8s is offline   Quote Quick Reply
Old 12-14-2011, 11:57 PM   #2
Jeeper
 
kmanator's Avatar
 
Join Date: Nov 2011
Posts: 287
Quote:
Originally Posted by Jb8s View Post
I have a 2000 wrangler, 4.0 inline 6. A couple of weeks ago I parked at work and the check engine light came on. The oil pressure had bottomed out. Rev'd the engine and it went back to around 20lbs. This continued fir the next week or so every time I stopped at a red light or parked. I changed the sending unit thinking that would do the trick, but still had the same problem. Today I checked the pressure with a manual gage and it was in fact losing pressure at idle.(hoping I just had a bad dash gage) I was told that Chrysler had, in the past, put a coating on the inside of the oil pan and that it has been known to flake off and cause problems, but seems to me like if that was the case, it wouldn't gain pressure when the engines rpm's were increased! Anyone else experienced this issue?
How many miles on it?I have had vehicles do what you are experiencing and it's not good news.Sounds like she's worn out in the main/rod/cam bearing department which is were the oil pressure derives from.As the tolerances open up..oil pressure goes down.Option A is to drop the oil pan and install a high volume oil pump to boost the pressure from the loose bearings.Also you can see if the pick up screen is clogged.

kmanator is offline   Quote Quick Reply
Old 12-15-2011, 05:20 AM   #3
Newb
 
Jb8s's Avatar
 
Join Date: Dec 2011
Posts: 3
It has 67k. I think I will drop the pan and just see what is going on in there though. I just hope it's not a major issue, but I'm afraid you're right, I don't expect good news. Thanks!
Jb8s is offline   Quote Quick Reply
Old 12-15-2011, 08:40 AM   #4
Jeeper
 
Join Date: Mar 2011
Posts: 193
Not in a Jeep, but a friend of mine had the same problem in an old Renault LeCar - low oil pressure at idle rpms. The engine had about 60k miles when this happened. We removed the oil pan, and the oil pump suction inlet mesh was about 80% clogged with hard sludge / metal shavings. We cleaned it, and the problem was gone. He kept the car for another 30k miles and the problem did not return.
jannikt is offline   Quote Quick Reply
Old 12-15-2011, 09:04 AM   #5
Jeeper
 
darkproximity's Avatar
 
Join Date: Feb 2011
Location: Not Spokane, WA
Posts: 12,000
OP.. do yourself a favor and run half a quart of ATF in your oil for a day then dump it and drop the pan.. beware you may need to buy a new gasket depending on how bad yours is
__________________
Apache chief, e ne chuk!
darkproximity is offline   Quote Quick Reply
Old 12-15-2011, 12:28 PM   #6
Newb
 
Jb8s's Avatar
 
Join Date: Dec 2011
Posts: 3
Sounds like a couple of good ideas. I'll try them and report back. Thanks guys!!!
Jb8s is offline   Quote Quick Reply
Old 12-15-2011, 03:04 PM   #7
Jeeper
 
kmanator's Avatar
 
Join Date: Nov 2011
Posts: 287
Quote:
Originally Posted by Jb8s View Post
It has 67k.
That should be good bearing wise ?...unless you popped a head gasket in the past and filled the motor with anti freeze...anti-freeze in the oil will eat the babbet material off the bearings destroying them...don't ask me how i know ...sounds like the oil pickup is clogged.If it's not clogged replace the O-pump with a high volume unit...I resurrected my '89 GMC that had the same symptoms as yours with a new pump.

kmanator 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
How to test the Fuel Pressure Regulator? Rise TJ General Discussion Forum 19 07-21-2011 03:37 PM
Oil Pressure drop, DD need help quick! Under the Palms TJ Tech Forum 12 10-04-2010 03:56 PM
Low oil pressure at idle 97tjcse TJ Tech Forum 9 08-24-2009 10:12 PM
Mud 4 Blood 6 - Woodstock GA tazmann910 Georgia Jeep Forum 0 03-06-2009 09:41 PM
Help reading Blood Pressure 97TJAC Off-Topic 16 07-21-2006 08:09 AM



» Featured Product

All times are GMT -5. The time now is 11:06 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