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Spark Plugs

8K views 34 replies 16 participants last post by  2005JGC 
#1 ·
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
 
#32 ·
From what I've heard in regards to HEMI engines, you either use the factory original copper Champions or the aftermarket Iridium ones. The engine doesn't seem to like the Platinum or Double Platinum plugs.

I have not verified anything myself though but I'm planning to change the 8 plugs below the coils to Iridium and see how it performs. I'd leave the other 8 (exhaust spark) stock.
 
#33 ·
OK, it's been a few months since I replaced the spark plugs, 8 iridium on compression stroke and 8 standard copper on exhaust strokes.

There's is a noticable difference. You can't go wrong with Iridium.

I'm thinking of modding the setup a little bit by removing the leads to exhaust strokes. I want to shorten them and have each coil firing up both spark plugs at the same time during the compression stroke. I don't think that any raw fuel would escape that.

Anyway, from now on, Iridium all the way.
 
#34 · (Edited)
I changed plugs on my 06 WK a couple times and on my 07 WK the day after I bought it.
The linked video is how I figured out the first change. Really is a piece of cake - just take your time. I usually clean my engine compartment before changing them. It keeps a clean engine compartment, plus makes the job less messy. While you're at it you may as well change your air filter as well. When you take the main intake box off be sure to be gentle with it and keep anything away from the MAF.

Take pride in doing work on your own vehicle - does a body good.
Good Luck!
 
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