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  #13  
Old 07-22-2010, 08:28 PM
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Re: 04 wj mpg

If you want. If you change the O2 Sensors, make sure you get the factory ones! It's best for you and the Jeep! You don't want to have any problems in the future!
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  #14  
Old 07-22-2010, 08:35 PM
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Re: 04 wj mpg

I learned this actually a when I got the CEL. I got an aftermarket one and immediately the CEL came back. I ordered an OEM one from Kolak, which was actually cheaper then the aftermarket (go figure) and have had no problems since
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  #15  
Old 07-25-2010, 11:37 AM
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Re: 04 wj mpg

yeah 25 hwy its a selec-trac went to jersey last week about a 75 mile trip and thats what it read on mileage that was also going only 60 the whole time but it's true

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Originally Posted by Chaoul1 View Post
25 Highway? Do you only have 2WD? Or is it Select-Trac?
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Old 07-26-2010, 01:08 AM
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Re: 04 wj mpg

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Originally Posted by mrjaydeeone View Post
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?
spark plugs on the WJ 4.0 or 4.7 should be changed at 30,000 miles
your at 123,200 so your a bit past 30K
decent info hear on the how to http://wjjeeps.com/service/sparkplugs.htm
and you have a inline so dont have to reach to far back

also might want to do the diff and TC fluid since it may need it. if the fluid is worn out could effect MPG as well

i just changed mine on the 4.7 last Thursday at 42K+ and they were the orignals and were over gaped and needed them. will see if it helps my MPG which is normally can be from 10-16 MPG depending on what i am doing, carrying a load or taking a long trip.

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Originally Posted by violant00 View Post
yeah 25 hwy its a selec-trac went to jersey last week about a 75 mile trip and thats what it read on mileage that was also going only 60 the whole time but it's true
unless you did the math i think its a bit high.
since jeep could only get 21 MPG highway with 2WD when they tested and they try to push the limited on what they can get.
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  #17  
Old 07-26-2010, 01:17 AM
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Re: 04 wj mpg

Usually between 15-17...
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  #18  
Old 07-26-2010, 06:01 PM
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Re: 04 wj mpg

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Originally Posted by Chaoul1 View Post
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!
I checked under the hood at the sticker and it says Rc12mcc4 gap .040
and when I looked back on wjjeeps.com it shows that for a 4.7. I only have a 4.0.
Now I am a bit confused. Could the plugs and gap be wrong in my Jeep? Could the hood have just been replaced at somepoint with a used one?
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Old 07-26-2010, 06:58 PM
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Re: 04 wj mpg

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Originally Posted by mrjaydeeone View Post
I checked under the hood at the sticker and it says Rc12mcc4 gap .040
and when I looked back on wjjeeps.com it shows that for a 4.7. I only have a 4.0.
Now I am a bit confused. Could the plugs and gap be wrong in my Jeep? Could the hood have just been replaced at somepoint with a used one?

did your jeep have a engine swap?
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  #20  
Old 07-26-2010, 07:50 PM
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Re: 04 wj mpg

not that I know of. I honestly doubt that it would have. I need to look at the sticker again and see if it says 4.7 on it anywhere too.
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  #21  
Old 07-26-2010, 08:02 PM
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Re: 04 wj mpg

Lol. My friend has a WJ. I never changed my plugs on my WJ. I will ask him what type of plugs. If not just call up the dealership and they should tell you what number or ask Milous!!!!! Calling Milous!!!!
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  #22  
Old 07-26-2010, 08:59 PM
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Re: 04 wj mpg

LOL. I sent him Milous a PM to take a look at this thread
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  #23  
Old 07-26-2010, 09:15 PM
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Re: 04 wj mpg

Quote:
Originally Posted by mrjaydeeone View Post
not that I know of. I honestly doubt that it would have. I need to look at the sticker again and see if it says 4.7 on it anywhere too.
Is it a factory sticker, not a sticker added by the dealer?

If you PM me last 8 of VIN I can verify original engine.
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  #24  
Old 07-26-2010, 09:47 PM
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Re: 04 wj mpg

Quote:
Originally Posted by Milous View Post
Is it a factory sticker, not a sticker added by the dealer?

If you PM me last 8 of VIN I can verify original engine.
it looks like a factory sticker. PM sent
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