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Unread 10-06-2013, 08:58 AM   #1
zaxfire69
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01 XJ Sport spark plug recommendations?

I'm about to change plugs in my 01 XJ Sport. It has the H.O. 4.0 and calls for the RC12ecc. I see folks say there are several different plugs you can run. When it is warmed up and idleing I feel a slight miss. What are you guys opinions on best plug to run for daily driving?

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Unread 10-06-2013, 09:13 AM   #2
cruiser54
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Get NGKs.
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Unread 10-06-2013, 09:21 AM   #3
zaxfire69
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What is the Number on NGK's?
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Unread 10-06-2013, 09:36 AM   #4
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Zfr5n
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If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

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My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 10-06-2013, 09:55 AM   #5
Muddy97Cherokee
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The cheap copper ones are the best. 4.0's like the ****ty stuff.
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Unread 10-06-2013, 10:16 AM   #6
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Quote:
Originally Posted by Muddy97Cherokee View Post
The cheap copper ones are the best. 4.0's like the ****ty stuff.
Yup. Nuttin' fancy.
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 10-06-2013, 10:27 AM   #7
Muddy97Cherokee
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I usually get the copper plus ones from AutoZone and they last me for awhile and make the engine run good. They are $2.00 a plug. But plug wires make the difference. Have found that good plug wires are better.
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Unread 10-06-2013, 11:42 AM   #8
zaxfire69
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Sounds good. I've run NGKs in my Honda forever. Never had a problem. I'm on my way to get some now. Should I pick a spark plug wire puller up while I'm there?
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Unread 10-06-2013, 11:50 AM   #9
Muddy97Cherokee
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Never knew there was a spark plug wire puller. All of them are easy to get off. 1 and 6 are tricky.
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Unread 10-06-2013, 12:21 PM   #10
HawksWin
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01 Should have the coil pack, Shouldn't need wire pullers.
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Unread 10-06-2013, 12:49 PM   #11
zaxfire69
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It has coil packs . Looking at them now. Going to let it cool off awhile. Just drove it. Got the NGK's. 4 bolts and move a couple of hoses and I guess it should come off.???
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Unread 10-06-2013, 01:02 PM   #12
zaxfire69
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Guess this thing has a block heater on it. It has a 110v connector coming out from under intake Manifold. I'm guessing that is what this is. Don't need this in Mississippi I don't think!
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Unread 10-06-2013, 01:35 PM   #13
zaxfire69
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Halfway through and have 2 different types of plugs. Go figure!
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Unread 10-06-2013, 02:28 PM   #14
zaxfire69
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image-331937079.jpg

Think I know why I had a miss!
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Unread 10-07-2013, 06:22 PM   #15
zaxfire69
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NGK's Gotta GO.....My Jeep will not get to operating temperature. I know it is cool outside, but it should at least get to 210 degrees and it isn't ...Probably around 180. I can lliterally see the gas needle moving. Even with my old plugs I had better gas consumption. Guess I will put new plugs like I had back in there. Were the NGK's suppose to be used with the coil packs our distributer model XJ's
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