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Unread 05-05-2009, 01:36 AM   #16
jumbojeepman
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I like NGK's. Every NGK plug I've ever pulled from the box was correctly gapped. Definitely can't say that about Champions. However, they are sometimes difficult to find for American trucks. In these cases, I use Autolites.

I definitely wouldn't waste any money on platinum plugs unless the manufacturer calls for them.

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Unread 05-05-2009, 08:35 AM   #17
Happy Joe
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I use champions, with a brass terminal distributor cap (aluminum terminals are a hidden problem waiting to happen) along with a msd-6a ignition box. Check and re-gap the plugs every 75,000 miles or so.

Enjoy!
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Unread 05-05-2009, 08:06 PM   #18
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Good 'ole (and cheap) Champion Copper Cores are in my Jeep. Runs great!
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Unread 05-07-2009, 11:44 AM   #19
Pillswoj
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Anything but Bosch

The +4's are too cold of a plug in the 4.0L and they will carbon up.

My Thread with pics from trying Bosch +4s http://www.jeepforum.com/forum/f9/spark-plugs-should-have-listened-jerry-541430/

I now use Autolite AP985's and they work great . If you have a distributerless ignition use the APP985s (Double Platinum)
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Unread 05-11-2009, 11:19 PM   #20
1998zj
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I tried to run Bosch in my 89 4.2. It missed and sputtered so bad I went back and bought Champions the next day. Problem solved. I will never run another Bosch plug.
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Unread 05-12-2009, 04:27 PM   #21
KrazyGimp
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I'm throwing in my vote for Champion truck plugs too. I've tried everything from them to the most expensive 4 tip platinum plugs you can buy and I've always gone back to Champion's. I threw a set of Bosch Platinums in the garbage the day I bought them because my Jeep wouldn't run worth a crap. The Champions just seem to run so much better in my motor, never had one problem.
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Unread 05-13-2009, 10:00 AM   #22
CoriolisSTORM
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Bosch +4s go in my Caliber. My wrangler 2.5L only gets Champion truck plugs. Only replaced the plugs once in it, and neves done the rotor/cap in 80k miles and mine still runs great.
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Unread 05-20-2009, 01:49 AM   #23
AndThenRobSaid
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I used to own a saturn and am a member of a forum for saturn enthusiasts (let the flaming begin, i know...). Everyone over there hated bosch platinums like the plague. Equated in usefulness to the turbonator. NGKs seemed to work well for my N/A 4-banger that I had.
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Unread 07-03-2009, 10:57 PM   #24
TDmaster
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My '09 JK comes stock with platinum plugs (according to the manual), but since I am installing a RIPP Modifications Supercharger, their kit comes with NGK IX Iridium plugs one step colder than stock. I was looking for better spark plug wires and decided to purchase the MPG Plus Spark Plug Wires by Granatelli for the JK. They are "0" resistance wires and suppose to deliver more spark to the plugs. I have a concern that the coil may prematurely fail due to the zero resistance and need a lead on a high performace coil to replace the stock one. Can't seem to google one on the internet????
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Unread 07-04-2009, 12:02 AM   #25
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I know the newer (01+ maybe) 4.0's have coil on plug. It wouldn't surprise me if the V6's in the JK's did too, but I have no idea. You've done your research/know what you're talking about, right? I only say that 'cause I know someone that went to buy plugs/wires/coil for his TJ, only to find out that he didn't have them . That really threw him for a loop.
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Unread 07-04-2009, 01:52 AM   #26
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I've used Denso Iridium plugs in a SC 3.2 MB motor and noticed a fairly substantial difference. If they make them for the Wrangler, i'll throw them on when the time comes. I also changed the stocke wires to Magnecor 8.5mm - --pretty nice.
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Unread 07-11-2009, 09:51 PM   #27
southernmudzj
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i use autolite 24s and they work great
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Unread 07-12-2009, 12:06 AM   #28
xJoshxx
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More electrodes Does nothing those +4's worthless they all take path of least resistance so if 1 plug was off .0000000000000000000000000000001 that is the side that gets the spark.

I use autolights in the 4.0slow
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Unread 07-15-2009, 12:18 PM   #29
brendanc
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Libertys might not be the most popular jeep for trail riding because of the IFS, but I try anyway...

That said, I need to replace my spark plugs and I was looking for the best spark plugs I can get. Whatever came with my jeep are still in there at 55k and I am starting to feel the engine not running as smooth as it used to.

I read through the thread and you guys seem to like Champion... but should I go with Platinum or Iridium? There is a $6, Iridiums being more expensive. Thoughts?

Any other tips would be appreciated, I want to get the job done well and right the first time.

Edit: Also, I am getting many mixed results as to the gapping for my vehicle? The spark plugs say do 0.035, under the hood says 0.040, and haynes manual says 0.045? What gives? Who should I listen to?

Last edited by brendanc; 07-15-2009 at 01:26 PM..
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Unread 07-16-2009, 12:31 AM   #30
CB3
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I don't know what is best for a 2.5L or a 4.2L, but I know from experience with my XJ and LJ that the 4L loves NGK copper plugs. Just the regular NGK copper, not the platinum.

I once tried some fancy Bosch platinum 4 prong plugs in my XJ and it ran terrible (no low end torque). The stock plugs (Autolite I think?) are OK. Boche terrible. NGK cooper are by far the best for the 4L (idles smoother, same midend and highend torque as the other two plugs I mentioned, but way better low end torque and smoother running at lowend).

For the 4L I've found NGK are the best. The regular cooper NGK.

NGK also worked best in my motorcyle. I'm really an NGK fan after trying Champion, Autolite, Bosch, and NGK in various engines.
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