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Old 03-23-2010, 07:40 PM
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4.0 terrible mpg

Hey guys my 4.0 WJ has about 92500 miles on it and my mpg are terrible I'm barely getting 13 between highway and city... Any suggestions as to why this may be happening?
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Old 03-23-2010, 07:44 PM
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Re: 4.0 terrible mpg

That's pretty good for City. You should replace you PCV Valve, New Spark Plugs, new Air Filter (If Dirty), new fuel filter, Fresh oil change. Those should help. I won't guarantee 5MPG more but it will help. Plus it also depends on your Foot.
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Old 03-23-2010, 08:11 PM
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Re: 4.0 terrible mpg

Alright thanks Ill check the air filter tomorrow and then I'll go get new sparkplugs this weekend... See if that helps.. And I just got an oil change this past weekend
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Old 03-23-2010, 08:16 PM
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Re: 4.0 terrible mpg

Get the recommended Spark Plugs. Don't get the most expensive ones. And make sure you Torque them down to the correct Torque.
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Old 03-23-2010, 08:22 PM
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Re: 4.0 terrible mpg

Alright I'm gunna talk to my dad about it and if he's not busy this weekend he'll help me do it
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Old 03-23-2010, 08:27 PM
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Re: 4.0 terrible mpg

It's real simple and very easy. Here's something that will help you a bit http://wjjeeps.com/service/sparkplugs.htm
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Old 03-23-2010, 08:30 PM
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Re: 4.0 terrible mpg

Hey thanks for the help man
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Old 03-23-2010, 08:47 PM
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Re: 4.0 terrible mpg

come on, I did the sparkplugs by myselfe and I'm only 16 :P lol

what I'm saying is that if I can do it you can too!
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Old 03-23-2010, 08:50 PM
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Re: 4.0 terrible mpg

I'm only 16 too dude I'm just gunna have him teach me how todo it so I dnt f&$k anything up
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Old 03-23-2010, 09:04 PM
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Re: 4.0 terrible mpg

there's noting to it, except getting the coil packs off was a little tricky.
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Old 03-24-2010, 09:27 AM
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Re: 4.0 terrible mpg

Quote:
Originally Posted by 2000 Grand View Post
I'm only 16 too dude I'm just gunna have him teach me how todo it so I dnt f&$k anything up
I'm only 18. When I first got my WJ I was 16 . They are pretty easy to work on. Don't worry you won't mess anything up just take your time.
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Old 03-24-2010, 09:35 AM
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Re: 4.0 terrible mpg

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Originally Posted by 2000 Grand View Post
I'm only 16 too dude I'm just gunna have him teach me how todo it so I dnt f&$k anything up
Some of my fondest memories are of my dad and I working in his garage together. One of the things I miss the most. So have fun and enjoy the day with him.
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