1997 4.0L 6 Maintenance - JeepForum.com
LinkBack Thread Tools
post #1 of 6 Old 07-16-2010, 10:23 PM Thread Starter
Registered User
1997 TJ Wrangler 
Join Date: Jul 2010
Location: Savannah
Posts: 1
1997 4.0L 6 Maintenance

New to Jeeps and forum. Great resources here. First post for me!
I have a new to me 1997 Wrangler Sport 4.0L 6 Cylinder Manual 5 spd with 33k on the engine. I unfortunately don't have any service records for the vehicle. Besides all the fun stuff(lift, tires, bumpers), what should I do to the vehicle in relations to the engine and drive train. I've seen tune up kits fairly inexpensive on the internet. Worth the time? Should I have all the fluids flushed? Engine seems to be running well although a little rough at idle. I have no experience with this particular engine so not sure if that is normal. With the age of the vehicle, not sure if normal guidelines apply or if an accelerated list of pm should be performed. Any insight would be great. Thanks

Sav97TJ is offline  
Sponsored Links
post #2 of 6 Old 07-16-2010, 10:30 PM
Registered User
1997 TJ Wrangler 
Join Date: Oct 2009
Location: Littleton
Posts: 7,385
Welcome to the forum!

Go take a trip to your local auto parts store and get a new air filter, distributor cap and rotor, plug wires, champion spark plugs, and engine oil. I use 10-w30 mobil-1 full synthetic and for spark plugs don't get anything fancy. The 4.0 does not run well on those fancy double platinum import plugs. Some good Champion Single platinum plugs are good plugs.

These next ones are just bonuses:

Ignition coil pack and o2 sensors wouldn't be a bad thing. Diff. oil, tranny oil, and t-case oil could be changed. Pop open the radiator cap and take a look at the coolant. If its gross and rusty brown flush it, back flush it, and flush the heater core real good. Depending on the condition of the radiator you might want to replace it with all metal. I have a 97 and mine is disgusting and leaks out the crimps if filled to high. Flushed my system and the next day the new coolant was already disgusting again. But If money doesn't allow I wouldn't worry about it.

The 4.0 is a great engine and should actually run pretty smooth. Its an Inline 6 so it is very balanced and should not be rough. Though it does make noises so don't get to worried about that, only get worried when new unknown noises pop up.
freeskier93 is offline  
post #3 of 6 Old 07-16-2010, 11:23 PM
Running Secretly Amok!
2002 TJ Wrangler 
Join Date: May 2007
Location: Ventura ,CA.
Posts: 9,716
GOLENJEEPTJ is offline  
post #4 of 6 Old 07-17-2010, 12:23 AM
Registered User
2003 TJ Wrangler 
Join Date: Jun 2008
Location: Jamestown, ND
Posts: 6,949
As stated check the plug wires and see how they look before replacing, pull the spark plugs and check them, they may be able to tell yo why you rough idling. Change the oil immediately, buy a new air filter if it is dirty. Next look at the transmission fluid is it still red or brown, if it brown it's time to replace it. Coolant is the next thing that should be done, every 3 yrs it should be replaced regardless of mileage. Replace the t-case fluid, and differentials if you have no idea when they were changed, because they are often forgotten. Check you power steering and brake fluid to make sure they haven't turned to sludge, replace those if necessary.

So the short list would be engine oil, coolant, t-case, and differentials. If needed, change the other fluids.


2003 Jeep Wrangler Rubicon
4.0L, 42RLE, Dual Tops, Full Doors, JKS Front Disconnects, Cragar Soft 8 Black Wheels, 33x12.5x15 Goodyear Duratracs, .75" Front Coil Spacers, Bushwacker 6" Flat Fender Flares, Skid Row Steering Box Skid, LubeLockers, Rubicon Locker Mod, OBA, Cobra 19 Ultra III CB, 3' Firestik, Rough Country 2.2 Steering Stabilizer, RC 1.25" BL, RC 1" MML, RC Grab Handles, Fog Lamp Bent Pin Mod, 4" Apline S Series Speakers, Kenwood Excelon 6.5" Speakers, 6.5" JL Audio 6W3V3 Subwoofer (in center console) w/MTX Thunder 202 amp, IPF H4 Headlight Housing, Sliverstar H4 bulbs.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

"Buying a jeep and not taking it off road, is like buying a dragster and never taking it to the track"
RogueSpear2023 is offline  
post #5 of 6 Old 07-17-2010, 06:25 AM
Registered User
1997 TJ Wrangler 
Join Date: Apr 2010
Location: Maine
Posts: 14
You should also pull the front drive shaft and inspect and lube the double cardan joint. This has got to be the number 1 neglected maint. item and can cause all kinds of problems.
BJN644 is offline  
post #6 of 6 Old 07-17-2010, 07:01 AM
TheBoogieman's Avatar
2003 TJ Wrangler 
Join Date: Aug 2006
Location: CharlottesHELL
Posts: 35,877
Welcome to JF.
TheBoogieman is offline  

jeep , maintenance

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
After-Mud Maintenance T0ADMAN Wrangler General Discussion 16 06-12-2009 06:05 PM
50k maintenance tj-lover TJ Wrangler Technical Forum 1 07-22-2008 01:08 PM
Self Maintenance? BRC223 TJ Wrangler Technical Forum 13 11-21-2007 05:50 PM
Maintenance BUDAH77 TJ Wrangler Technical Forum 4 04-26-2006 05:11 PM
Maintenance ?s mcg TJ Wrangler Technical Forum 12 03-23-2005 04:28 PM

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