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mrjaydeeone 07-21-2010 05:36 PM

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?

Chaoul1 07-21-2010 07:08 PM

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.

mrjaydeeone 07-21-2010 07:22 PM

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 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.

Chaoul1 07-21-2010 07:26 PM

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 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!

mrjaydeeone 07-21-2010 07:48 PM

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?

straty1987 07-21-2010 10:45 PM

Re: 04 wj mpg
al the info you need

mrjaydeeone 07-21-2010 10:48 PM

Re: 04 wj mpg

Originally Posted by straty1987 (Post 239614)

yeah I got there afterwards haha. thanks bud

Chaoul1 07-21-2010 10:59 PM

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.

violant00 07-22-2010 11:39 AM

Re: 04 wj mpg
highway 25 for me and city 13 really nothing you can do but be easy on the gas pedal

baronvonhavok 07-22-2010 01:23 PM

Re: 04 wj mpg
I get about 14 in the city and about 20 on the highway.

Chaoul1 07-22-2010 03:59 PM

Re: 04 wj mpg

Originally Posted by violant00 (Post 239813)
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?

mrjaydeeone 07-22-2010 05:27 PM

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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