cherokee 4.0 oil pressure issue, please help - JeepForum.com

 
LinkBack Thread Tools
post #1 of 4 Old 08-28-2013, 07:11 PM Thread Starter
YeOlCherokee
Registered User
 
Join Date: Aug 2013
Location: Philadelphia
Posts: 18
cherokee 4.0 oil pressure issue, please help

98 cherokee, 4.0, around 130,000 miles

Okay, so i am currently running castrol high mileage 10w30 oil, but it did this before i started using this oil. No change, i just always used this oil in all of my vehicles.

Once the truck has been running for a good while and it is at its full running temperature, the oil pressure drops low at idle. It usually will hang on to the last line before 0, so i'm guestimating that this is 10psi. sometimes it looks like 9, but it could be just the angle im looking at the gauge. It NEVER goes below this point. Although, once i accelerate, it rises again, back up to 40/50, whatever is normal. Also, when it is at this low psi, i can hear like a pup pup pup pup (sorry, i dont know how to describe it better) inside the cabin coming from the engine. My chrysler sebring used to make the same pup pup pup noise.

i am definitely concerned, but everyone is telling me that its SUPER common for jeeps to run this psi at hot idle and that the noise that im hearing is normal as well.

additional info: doesnt burn any oil, doesnt use any coolant, coolant is super clean and green, and oil looks absolutely fine.

Any ideas?

YeOlCherokee is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 08-28-2013, 07:28 PM
bigbill888
Registered User
1996 ZJ 
 
Join Date: Nov 2009
Location: michigan
Posts: 969
I've had this before, a new sending unit fixed it.

96 ZJ Laredo, 4.0, 242, 230K
95 ZJ Limited, 4.0, 242, 140K
98 XJ Sport, 4.0, 231, 140K
All work well
bigbill888 is offline  
post #3 of 4 Old 08-28-2013, 08:12 PM
Paradise XJ
Registered User
1988 MJ Comanche 
 
Join Date: Jan 2007
Location: Paradise, CA
Posts: 2,424
I only have Renix gauges to look at so correct me if I'm wrong about the later models. My gauge has four lines - 0, line, 40, line, 80. Both my rigs idle (hot idle) run at the first line, between zero and 40...so I would a$$ume, the first line is 20psi...or 19 in your case...and runs at 40 to the next line...aka60 psi.

Sounds perfectly normal to me.


As far as the pup, pup, pup noise...I dunno.

1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black
˘
Paradise XJ is offline  
post #4 of 4 Old 08-28-2013, 09:05 PM
M35A2
Registered User
1995 XJ Cherokee 
 
Join Date: Jun 2012
Location: Monrovia
Posts: 748
Put a manual gauge in it and see what it is.

Volunteer, American Society of Military History. http://tankland.com/
Just got a 1989 YJ too!
M35A2 is offline  
Reply

Tags
cherokee , engine noise , oil , oil pressure , psi

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome