Looking for common Jeep 4.0 problems - JeepForum.com
LinkBack Thread Tools
post #1 of 6 Old 08-20-2009, 12:22 PM Thread Starter
Registered User
Join Date: Aug 2009
Location: Boise
Posts: 4
Looking for common Jeep 4.0 problems

I have a 95 Jeep Cherokee 4.0 and it has 181,000 miles on it. I would like to try and make it last 250,000 miles I usually put about 12,000-13,000 miles in it a year. Most of my driving is in the winter time, but I do tow a trailer with a raft on it in the warm summer months. I might be getting a snowmobile this year so more towing. I don't do much off roading but dirt roads can be common during the summer months.

I am looking for common problems that I can try and take care of prior to them happening. For instance I just broke a motor mount I did a search and it looks like its a fairly common problem with the 4.0's. Some of the things I have replaced are water pump, thermostat, starter, alternator, and value cover gasket. If you guys can can give me some ideas of things I should change now that would be great.


SkierAtHeart is offline  
Sponsored Links
post #2 of 6 Old 08-20-2009, 12:31 PM
Registered User
Join Date: Nov 2007
Posts: 6,336
Add transmission cooler, valve cover gasket always leaks at the back of the head. Keep it full of oil and it will last forever.

Originally Posted by Motorcharge View Post
So do you actually hear your thoughts in your head or is it just sort of a dull roar before you smash your face into your keyboard and just submit whatever dumb **** ended up on the page?
justanotherjpr is offline  
post #3 of 6 Old 08-20-2009, 12:56 PM Thread Starter
Registered User
Join Date: Aug 2009
Location: Boise
Posts: 4
Thank you, What about ball joints? A couple of the rubber boots look pretty worn.
SkierAtHeart is offline  
post #4 of 6 Old 08-21-2009, 06:38 PM
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota
Posts: 8,860
Most guys pocketbooks preclude them from changing stuff out before its time. I'd recommend you do the same; it just makes sense on an economic basis. Most of the problems with the XJ won't leave you on the side of the road. Fix it when it becomes symptomatic.

As for sensors, the one that is a very common failure on the 4.0 is the crankshaft position sensor. "Some" guys replace it strictly as a preventive measure and keep the old one as a spare. They are kind of a PITA to replace, especially on the side of the road or on the trail.

Best recommendation for longevity? Replace ALL fluids regularly. Coolant, oil, tranny, differentials. I see guys go nuts all the time with mods, etc and they still have their original tranny fluid in there at 75k. Fluids are the lifeblood of your XJ.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
tjwalker is offline  
post #5 of 6 Old 08-21-2009, 06:47 PM
Registered User
1992 XJ Cherokee 
Join Date: Aug 2007
Location: High Springs
Posts: 1,211
Originally Posted by SkierAtHeart View Post
Thank you, What about ball joints? A couple of the rubber boots look pretty worn.
If there's no play in them just keep them greased real good and they should be fine


“Don’t Tread On Me”

cornbrizzle is offline  
post #6 of 6 Old 08-21-2009, 09:03 PM
Registered User
1990 XJ Cherokee 
Join Date: Aug 2009
Location: fargo
Posts: 482
the main leak I have been replacing up here in ND lately has been the trans/transfer case seals. the seal at the back of the trans starts leaking and it comes out between the two. the other is make sure your rear diff is always full. rear axle seals are another problem area.
loneeagle78 is offline  

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
common problems with Jeep A/C system? JEEPINWI XJ Cherokee Technical Forum 23 08-14-2015 09:32 AM
Common problems in used XJs?? 4.0H.O.XJ XJ Cherokee Technical Forum 13 10-29-2006 03:08 PM
Common Jeep Problems Voyager XJ Cherokee Technical Forum 18 08-25-2006 12:31 PM
What are the common problems of an 89 with a 4.0 cmckeon XJ Cherokee Technical Forum 4 09-02-2005 09:31 PM
Common problems in 96 Nightcon777 XJ Cherokee Technical Forum 5 05-01-2005 09:51 AM

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