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  #13  
Old 03-08-2011, 06:57 PM
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I need to do mine too, Dave. Plus my egr valve, pcv valve and that's it. Already cleaned my throttle body. We can have a Jeep maintenance day lol

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  #14  
Old 03-09-2011, 01:15 AM
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Re: Spark Plugs

I just did a tuneup on a 4.7l commander with 33k miles... and it needed it. The electrodes were all rounded off.
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  #15  
Old 03-15-2011, 05:16 PM
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Re: Spark Plugs

is everyone putting the copper spark plugs back in? I need to change mine but dont feel like doing it every 30,000 which you really need to do when it comes to copper plugs
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  #16  
Old 03-15-2011, 08:18 PM
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Re: Spark Plugs

i just changed mine at 43k on my 4.7l ... i think the place used double platinum spark plugs... my jeep sounds more beefy now and i feel like it got its pep back
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  #17  
Old 03-15-2011, 10:00 PM
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Re: Spark Plugs

It is HIGHLY suggested that you use the factory plug. there are known issues with using aftermarket plugs... I wont make a blanket statement that ALL aftermarket plugs will cause issues, but I dont know what ones. It is suggested that you use factory recommended plugs.
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  #18  
Old 03-22-2011, 06:48 PM
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Re: Spark Plugs

How important is it that you change the spark plug wires? Any real gains? Is it difficult?
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  #19  
Old 03-23-2011, 02:09 AM
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Re: Spark Plugs

It is VERY VERY VERY important... I would change your plug wires once every 15k miles at LEAST.











ok, Im sorry, Im a douche, your 4.7l doesnt use sparkplug wires. It uses coil on plug technology.
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  #20  
Old 03-23-2011, 08:17 AM
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Re: Spark Plugs

Quote:
Originally Posted by 2005JGC View Post
ok, Im sorry, Im a douche, your 4.7l doesnt use sparkplug wires. It uses coil on plug technology.
Well I guess that explains why I couldn't find anything on it. Sorry for my ignorance as I know virtually nothing about cars outside of electronics, but am going to attempt to give chaning the spark plugs a go.

Thanks for your help.
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  #21  
Old 04-02-2011, 02:33 PM
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Re: Spark Plugs

Again I'm new at this, but am going to give it a go. Is a torque wrench required to change spark plugs?
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  #22  
Old 04-02-2011, 10:43 PM
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  #23  
Old 04-03-2011, 12:08 AM
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Re: Spark Plugs

Quote:
Originally Posted by DGora31 View Post
I have about 46k on my 06 4.7 and i have yet to change my spark plugs... i think i am starting to notice my mpg's drop and a slight loss of power but it could just be me. I work about 12 hrs a day right now since its tax season and mechanics aren't open when i have time to take in my Jeep. Can i get some advice on changing the plugs myself and how much longer i can let them run with the current plugs in there... i got the Jeep with 23k on it so i doubt they've ever been changed, thanks in advance.

-Dave
here's my writeup for my 5.7L

http://www.jeepgarage.org/showthread...655#post323655
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  #24  
Old 04-03-2011, 05:29 PM
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Re: Spark Plugs

Changing spark plugs per factory recommendation is very very important particularly if these are original equipment plugs. They do not use platinum tips so there is not much leeway in terms of plug life and gap erosion. Typically, factory installed platinum tipped plugs usually have a 100k mile replacement recommendation.

Instead of replacing them with OEM plugs, I usually specify double platinum plugs (platinum pads on the tip and electrode), just so I have some leeway on mileage, if I do not get to replacing them right away. These just cost slightly more but well worth it. It gives you more consistent performance over time since the plug gap remains constant and does not change over time.

One more thing, make sure you put a dab of anti-seize compound on the threads so next time you have to do it, the plugs will come out cleanly and easily.
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