3.7L horrible gas milage - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > 3.7L horrible gas milage

JKS Grand Cherokee WJ, Adjustable Front Trackbar 1"-6Teraflex JK HD Hinged Carrier & Adjustable Spare Tire FREE, FREE, FREE EVENT!! Save big on Lockers now till Apri

Unread 08-29-2011, 08:24 AM   #1
Registered User
2002 KJ Liberty 
Join Date: Aug 2011
Location: Jacksonville, Florida
Posts: 17
3.7L horrible gas milage

Yep, this one has me stumped. I have a '02 Liberty with a 3.7L V6. I am currently getting 11 MPG and this is what I have changed so far; Plugs (burning clean just wore out), Air Filter very dirty, Oil, Radiator Fluid (drain & flushed), trans fluid & filter, rearend fluid and brakes (front & back).
I'm not getting any codes which rules out O2 sensor. All I can think is a vacuum leak that I cannot find. Is there anything I may be missing? I'd appreciate any help. My appologies if I started this thread in the wrong place.

Last edited by ifelovr; 08-29-2011 at 08:43 AM..
ifelovr is offline   Reply With Quote Quick reply to this message
Unread 04-14-2012, 11:17 PM   #2
Registered User
Join Date: Mar 2012
Posts: 21
Check your vac lines. I'm having same problem and I noticed a lot of mine are dry rot and mine is an 02 with 143k.
JCemenski is offline   Reply With Quote Quick reply to this message

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.

Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.