3.7L horrible gas milage - JeepForum.com
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post #1 of 2 Old 08-29-2011, 07:24 AM Thread Starter
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2002 KJ Liberty 
Join Date: Aug 2011
Location: Jacksonville
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 07:43 AM.
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post #2 of 2 Old 04-14-2012, 10:17 PM
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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.
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