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Unread 02-08-2010, 01:02 PM   #1
krazykawl18
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Which spark plugs work best for my Cherokee?

I have an '01 cherokee with no engine mods done to it, and I just want to replace the current plugs and wires, cause she just hit 100k. I've researched hundreds of forums and web pages, but I still haven't come up with much. I think I might look at running some Autolite Copper Core plugs, since I've heard that Copper lasts longer and maintains better engine temperature.... I'm open to opinions on the wires as well...

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Unread 02-08-2010, 01:44 PM   #2
hidperf
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I've always ran NGKs in every car I've ever owned. When I used to tune my buddies big block Chevelle, NGK plugs were the only plug we could run that would survive the amount of nitrous we threw at it. I also ran them in my methanol powered street car with no problems.

In fact, I just orered a set for my own 92 XJ.
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Unread 02-08-2010, 02:02 PM   #3
crosschecker
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NGK's or Champion will do what you want.
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Unread 02-08-2010, 02:05 PM   #4
dlane2155
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I have been thinking of switching over to these plugs myself. I hear they are good but I do not know. Spark Plugs | Automotive Spark Plug | Motorcycle Spark Plugs | E3 Spark Plugs
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Unread 02-08-2010, 02:29 PM   #5
jeepkid03
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I've found that the 4.0L runs best on champion copper plugs. The same kind that it came with. Since your XJ is a 2001, it won't have plug wires or a distributor but instead has a coil pack ignition.

As far as the E3 plugs or other fancy ones, thats your own decision. Some people have issues running them, while others swear by them. I have personally seen a '94 Cherokee that ran fine on copper plugs, and couldn't idle right with the fancy plugs. It just seemed to run rough. Put in new copper ones and it ran great. The 4.0 is an engine of very old design and resembles more of a tractor engine compared to the high performance motors in modern cars. If it were me I'd just throw some new copper ones in and be done with it. Since you said yours are the original ones you might even see a gain in mpg.
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Unread 02-08-2010, 06:21 PM   #6
krazykawl18
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Thanks guys, I think I'm going to go with the champion coppers. Seems to be proven, since they've been highly regarded on this website and in other research I've done.
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Unread 02-09-2010, 12:51 AM   #7
suzzeyv
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Just Put in new copper ones and it ran great.Since you said yours are the original ones you might even see a gain in mpg.

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Last edited by suzzeyv; 02-09-2010 at 08:42 PM..
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Unread 02-17-2010, 09:43 PM   #8
mxboarder17
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Go with some french fries I heard they work well!
Karl, Jeepforum will run your f-ing life!!!
I can't wait to get home from Cali so we can test out that Cherokee!!!

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Unread 02-18-2010, 08:23 AM   #9
krazykawl18
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Haha kev, yeah, it has taken over my life. Just waiting for that K&N intake kit to come in, that should hopefully help with the mpg's, as well as the spark plugs I'm putting in. Got the Champion copper plus. Yeah, we'll have to take the jeep out, I still haven't thought of a nickname for it yet though....
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Unread 02-18-2010, 10:04 AM   #10
jsmiddleton4
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There are several threads on this by the way.

I found the Autolite 3924's to be quite satisfactory and when on sale at Autozone I pick them up for about a buck a piece.
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Unread 02-18-2010, 10:27 AM   #11
My1989Jeep
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I got some Split Fire plugs for $1.50 each at autozone they work pretty good.

Autozone Part Numbers:
NGK = 3248
Bosch Copper = 7927
Champion Copper = 344
Splitfire Copper = CC392D
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Unread 02-18-2010, 10:36 AM   #12
mxboarder17
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Quote:
Originally Posted by jsmiddleton4 View Post
There are several threads on this by the way.
He's new to this give him a break.
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Unread 02-18-2010, 11:10 AM   #13
rustyoljeep97
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I'm running the autolite platinum plugs. The plugs have given my 4.0 a lil more power under acceleration. I was running regular autolite plugs before they all overheated causing my no spark problem.
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Unread 02-18-2010, 01:56 PM   #14
BigD 275
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I currently run the E3 plugs in my Jeep. Over a year and no issues whatsoever.

Over the years I have used Champion, NGK, Autolite, etc. No real difference in any of them (at least that has been my experience).
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Unread 03-15-2012, 03:47 PM   #15
JVR6109
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I've had copper Champions in my '96 sport with the 4.0L for the past year and a half. Engine runs perfect with no hesitation and pretty decent pick up. I'm satisfied. And they were cheap as *****!
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