Plug change or not to change 03 WJ 4.7 - Jeep Garage - Jeep Forum

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  #1  
Old 01-30-2015, 10:06 PM
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Plug change or not to change 03 WJ 4.7

Greetings,

So, I have an 03 WJ 4.7 with 191k on the odometer and it runs just fine. Idles perfectly, runs smooth and generally has nothing wrong with it at all. I did all of the oil changes every 3k miles since about 70k when I got it about 5 years back. I didn't plan on keeping this vehicle but then came into some cash and got a 14 WK2 unexpectedly.

Anyways...it runs fine but I am doing work to the WJ to use it as a winter vehicle and rainy day car now. I have one friend that swears I should change out the plugs and I have another that says if it runs smooth don't touch it for fear of screwing something up. Both are really smart guys but I'd like some other opinions.

I'm open...

Thanks!

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  #2  
Old 01-31-2015, 07:27 AM
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Re: Plug change or not to change 03 WJ 4.7

Eventhough the "if itīs not broken, donīt mess with it" idea is good, i still would suggest to at least check the spark plugs. They wear out over time, causing a larger distance for the spark to travel, with a bigger change that the spark will find its way via a less resistance route. Also worn spark plugs will lower the mpg and increase the polution.
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  #3  
Old 01-31-2015, 12:21 PM
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Re: Plug change or not to change 03 WJ 4.7

I personally would just do it. Reason being is it really can't hurt anything and plugs are super easy on the 4.7. It's atleast piece of mind knowing you have new plugs and getting the best efficiency and power. Make sure you get the right plugs for the 4.7. I think they recommend the Champion 439's (or something like that) for the non-HO 4.7. Either way they are listed on wjjeeps.com. I was able to find them instock at a local auto parts store and they were only like 2 bucks a piece.
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Old 02-02-2015, 06:17 PM
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Re: Plug change or not to change 03 WJ 4.7

I think you are both absolutely right. I hadn't changed them since 110k was on the clock and I can put some NGK Iridiums in it and they should last the life of it. There really is nothing wrong with it and I'm super happy with this 4.7. Changing it out can only help.

Thanks again for the thoughts.
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Old 02-02-2015, 08:26 PM
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Re: Plug change or not to change 03 WJ 4.7

Quote:
Originally Posted by Logistics View Post
I think you are both absolutely right. I hadn't changed them since 110k was on the clock and I can put some NGK Iridiums in it and they should last the life of it. There really is nothing wrong with it and I'm super happy with this 4.7. Changing it out can only help.

Thanks again for the thoughts.
Best is to use the standard copper core plugs. I donīt know why, but i heard of problems when using special plugs.
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Old 02-03-2015, 09:31 PM
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Re: Plug change or not to change 03 WJ 4.7

Frango,

I'll take your advice.

Thanks for the help

~L
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Old 02-04-2015, 08:21 AM
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Re: Plug change or not to change 03 WJ 4.7

I'll say again..use the CORRECT plug not NGK iridiums. I believe it's Champiin 439's for the non-HO 4.7.
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Old 03-06-2015, 03:35 PM
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Re: Plug change or not to change 03 WJ 4.7

Simple answer, when was the last time you changed them, if around 30K miles change them and do use the champ copper plugs, no need to screw it up with fancy plugs which will throw codes!
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Old 03-06-2015, 08:44 PM
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Re: Plug change or not to change 03 WJ 4.7

My vote is change them. They are a wear item, and people get used to their vehicles feel and sounds over time. You may notice an improvement once you install them. Like others have said too, you really can't screw anything up here.
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