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  #1  
Old 07-21-2010, 05:36 PM
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04 wj mpg

Just wondering those of you with WJ's with a 4.0 what are you getting mpgwise?
I got mine back the start of the year. I am currently at 123,200 miles. Since I have gotten it I have fluctated between 15.8 and 15.9 mph. That's through the winter temps and the summer ones. No increase driving on highway for a decent length trip either.
What kinda mileage are the rest of yous getting?
what can I do to improve this?
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  #2  
Old 07-21-2010, 07:08 PM
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Re: 04 wj mpg

During the winter my Gas sucked on my 04' WJ 4.0L when I had it. Change the Plugs on it. That might help out a bit. I got about 13-14MPG's on the City and a good 18-20MPG's Highway with Full-Time 4X4.
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Old 07-21-2010, 07:22 PM
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Re: 04 wj mpg

good idea. I think I will change the plugs. Think I should do the wires also? I don't believe any of that has been changed in my WJ before I got it. Also what kinda plugs and wires are best to use here.
I am looking at wjjeeps.com to get an idea of the plug change on here. Seems like it's pretty easy. Is that the case? I have changed them in my galants before and those were inline 4s.
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Old 07-21-2010, 07:26 PM
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Re: 04 wj mpg

You don't have any wires. You have a Coil Pack. IMO I would just get the Factory Spec Spark Plugs. When you Open the Hood underneath the actual hood, you will see a specification for what type of spark plugs. It might be on www.WJJeeps.com And make sure you have the right extensions, especially for the last spark plug! And make sure you get them all gapped before you install them!
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Old 07-21-2010, 07:48 PM
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Re: 04 wj mpg

okay gotcha gotcha thank you for your help. Would I want to replace the coil pack while I am at it? or leave it alone unless it needed to be replaced?
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Old 07-21-2010, 10:45 PM
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Re: 04 wj mpg

al the info you need http://wjjeeps.com/service/sparkplugs.htm
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Old 07-21-2010, 10:48 PM
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Re: 04 wj mpg

Quote:
Originally Posted by straty1987 View Post
yeah I got there afterwards haha. thanks bud
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Old 07-21-2010, 10:59 PM
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Re: 04 wj mpg

And through in some a Can of SeaFoam into the Gas Tank. That's what I did. Made my WJ run a bit smoother.
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Old 07-22-2010, 11:39 AM
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Re: 04 wj mpg

highway 25 for me and city 13 really nothing you can do but be easy on the gas pedal
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Old 07-22-2010, 01:23 PM
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Re: 04 wj mpg

I get about 14 in the city and about 20 on the highway.
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Old 07-22-2010, 03:59 PM
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Re: 04 wj mpg

Quote:
Originally Posted by violant00 View Post
highway 25 for me and city 13 really nothing you can do but be easy on the gas pedal
25 Highway? Do you only have 2WD? Or is it Select-Trac?
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Old 07-22-2010, 05:27 PM
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Re: 04 wj mpg

well I looked at the maintenance records from the previous owner. The plugs were changed by the dealer in March of 07 at 91k. They shouldn't need to be replaced yet, right?
also I was told that I should replace all the 02 sensors. 1 was replaced a few months back when I got a CEL. Should I replace the rest?
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