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DGoral31 03-08-2011 01:19 AM

Spark Plugs
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.


2005JGC 03-08-2011 02:29 AM

Re: Spark Plugs
According to the maintainence schedule it suggests spark plug replacement at 30k miles. When you replace them go with the oem plug, the part numbere is on the emissions lable under the hood. make sure to have a decent assortment of extensions, and some patience.

TJXJWJ 03-08-2011 08:03 AM

Re: Spark Plugs
Yeah, and if it's anything like my 4.7 or my wife's 3.7, make sure you have some wobble extensions and universals. If I remember correctly, the back passenger's is a bitch. If you're on a schedule, start at the back of the motor and work your way forward. If you can get the back ones done, it's cake from there on out.

StoneCold 03-08-2011 09:41 AM

Re: Spark Plugs
Its dead simple. But definitely have some extension etc for your socket handy and stick to the stock champions.

There's a good how to video on you tube here;

SvenskaJeepGuy 03-08-2011 10:20 AM

Re: Spark Plugs
i changed mine last week, its easy but patience is golden. i didnt need any wobble extensions, just regular extensions and my air wratchet helped to speed up removal.

DGoral31 03-08-2011 10:59 AM

Re: Spark Plugs
wow that video is awesome... i appreciate the help... you guys know what kind of negative affects having old spark plugs might have on my car?

SvenskaJeepGuy 03-08-2011 11:05 AM

Re: Spark Plugs
wasting gas #1

DGoral31 03-08-2011 11:30 AM

Re: Spark Plugs
i know the jeep manual says to change them at 30k but there has to be some level of toleration post 30k... how far past 30k should i start noticing a real affect on my gas mileage/power?

SvenskaJeepGuy 03-08-2011 01:07 PM

Re: Spark Plugs
i changed mine at 25k miles and two were completely burned up (no electrode)

DGoral31 03-08-2011 01:12 PM

Re: Spark Plugs
shit... i need to get on these things asap

DGoral31 03-08-2011 01:13 PM

Re: Spark Plugs

Originally Posted by SvenskaJeepGuy (Post 371584)
i changed mine at 25k miles and two were completely burned up (no electrode)

does that mean you were basically running on 6 cyl since 2 of the pistons had no spark?? :confused::confused: thats crazy

SvenskaJeepGuy 03-08-2011 01:19 PM

Re: Spark Plugs
yes, i had a misfire code and it wouldnt go over 55

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