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Old 06-07-2007, 07:35 PM   #1
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spark plugs

whats everyones preference for spark plugs in their jeep?

I have a 4.0L

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Old 06-07-2007, 07:51 PM   #2
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I think the expensive ones are overated. I'd get the cheap ones.

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Old 06-07-2007, 08:18 PM   #3
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autolite
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Old 06-07-2007, 08:19 PM   #4
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I've been running Bosch Platinums in all my Jeeps.

Just don't get Champion Truck Plugs, I've seen a whole box explode not too long after installation.
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Old 06-07-2007, 08:46 PM   #5
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umm i agree, the expensive ones arent really any better, it is mostly the right gap, and good wires
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Old 06-08-2007, 12:23 AM   #6
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I've been running Bosch Platinums in all my Jeeps.

Just don't get Champion Truck Plugs, I've seen a whole box explode not too long after installation.
I have seen many people post that the champion truck plugs are the best when it comes to Jeeps. That is what I was set on getting, what trouble have you seen out of them??
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Old 06-08-2007, 12:38 AM   #7
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Mostly crappy quality. When I worked for an auto parts store, just about ever box that I opened had one or 2 that were cracked. And the ones that I did sell(not cracked) came back a couple of weeks later had failed. They either broke or blew up. It might have been those batches that we got, but I've always like to run Bosch plugs. Used them in our Jeeps, Dodge truck and even in our 4-Runner before that. I just stick with what has been working for me and my family.
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Old 06-08-2007, 12:44 AM   #8
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been using those chapion truck plugs on everything mopar i have.

Most mechanics will tell you mopar motors love the good ol cheapo champions.

in my 02 jeep im on my second set of chapion truck plugs. been averaging 14-16mpg with no hicups. part number 4412. Ive been doing tune ups on my mopars for about 10 years on my 72 powerwagon, my jeep, my 03 hemi truck, my old 97 ram, mymoms grand cherokee, little brothers XJ, and Dads XJ. never had a bad plug yet.

always check your gap before putting them in.
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Old 06-08-2007, 12:50 AM   #9
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Like I said, it could have been those batches that we got. I've never used them personally, just bad retail experiences.
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Old 06-08-2007, 01:01 AM   #10
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I don't have any experience to know what's best so I think i will give them a try. I am sure they aren't the best plug for lots of vehicles but everyone that has ran them in jeeps seemed to have liked them, so I think I will give it a shot!!
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Old 06-08-2007, 09:13 AM   #11
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Eh...call me crazy, but...
I run just your standard old run of the mill champions in my TJ.
I just changed them about 1500 miles ago.

I've always liked to put back in what came factory.
Mopar - Champion
Ford - Autolite
Chevy - AC
And so on...

Never had a problem.

I also worked at an automotive store...which will remain nameless, although its initials are NAPA....
I found that the only time we got in cracked plugs was because our freight driver used to like to chuck the freight in the door from almost across the street. He used to break up our alternators and starter noses too.
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Old 06-08-2007, 09:43 AM   #12
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.....

I've always liked to put back in what came factory.
Mopar - Champion
Ford - Autolite
Chevy - AC
.......
A friend of mine operates a few repair shops. He knows how to push a pencil as well, and keeps track of a lot of different things. He recommends the above as well.
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Old 06-08-2007, 09:45 AM   #13
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I been using Bosh platinum 4 since my very first car,back in 97,and I love them,never had a problem.
but I'm talking about hondas .This is my first vehicle that its not a honda, and i just was wondering what will be the best for the jeeps? my father use autolite on he's Grand cherokee,but I was wonder about iridium too.
Otherwise I will stick with platinum 4 from bosh.
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Old 06-08-2007, 09:56 AM   #14
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Champion 4412 (truck plug) is what I heard to use by some Cali wheelers and had just changed them out (4000miles ago) they were looking ok. but the store was out of them so I got the next Champion up platinum whatevers they are doing fine also.
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Old 06-08-2007, 10:05 AM   #15
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What about wires? Any preferences?
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Old 06-08-2007, 10:21 AM   #16
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A good set of 8mm graphite core wires...Belden (NAPA Brand) are good and they carry a lifetime warranty. All you need to do is keep your receipt.
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Old 06-08-2007, 10:36 AM   #17
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What about wires? Any preferences?
what year it's your wrangler?? It may has coil system!!
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Old 06-08-2007, 10:57 AM   #18
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What spark plugs to recommend has a lot to do with whether your TJ is the older style with a distributor or a newer distributorless model.

Personally on my '97 4.0L TJ, I have found my single-tipped (that just means the platinum is on just one side of the gap) platinum tipped Autolites perform as well as any other plug yet outlast any other non-platinum plug by probably 3X.

But those of you with the newer distributorless ignitions have to be careful to ONLY buy the more expensive double-tipped version of platinum plugs if you want platinum. That just means the platinum must be on both sides of the gap if your engine is a current distributorless model. A distributorless engine won't run properly if you run single-tipped (platinum on just one side of the gap) plugs. So for a distributorless ignition on the 4.0L engine, you need to either run a conventional non-platinum plug like the Champion #4412 Truck plug or a double-tipped platinum.

For those of us with older 4.0L engines that have distributors, we can run pretty much anything including the less expensive single-tipped platinum plug which is what I run. With this type of ignition, a double-tipped platinum plug has virtually no benefit over the less expensive single-tipped platinum plug since only one side of the gap erodes.
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Old 06-08-2007, 11:09 AM   #19
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But those of you with the newer distributorless ignitions have to be careful to ONLY buy the more expensive double-tipped version of platinum plugs if you want platinum. That just means the platinum must be on both sides of the gap if your engine is a current distributorless model. A distributorless engine won't run properly if you run single-tipped (platinum on just one side of the gap) plugs. So for a distributorless ignition on the 4.0L engine, you need to either run a conventional non-platinum plug like the Champion #4412 Truck plug or a double-tipped platinum.
What about 4 tips like Bosh platinum 4?
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Old 06-08-2007, 12:39 PM   #20
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What about 4 tips like Bosh platinum 4?
For some reason, Bosch Plus2 and Plus4 plugs don't perform very well in our 4.0L engines. Out of curiosity, I did a search on the Internet on that issue several months ago and found there's a lot of talk about problems with those plugs with a few other automotive brands too. A Bosch engineer offered a suggestion why some engines don't run well with them but unforunately, I didn't understand it well enough to recall exactly what the issue was.
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Old 06-08-2007, 08:15 PM   #21
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NGK's...i've used them in EVERY car I've owned, familys cars, and every BMW comes factory NGKs, the plugs last (what seems like) FOREVER...i use a set of NGKs in my 350hp turboed hyundai...they withstand a beating..and there WIDELY available for jeeps and cheap(price wise)
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Old 06-08-2007, 08:35 PM   #22
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I have used the Champion 4412's in my wifes 97TJ (4.0) and in my 99TJ (4.0), for years,with very good luck.
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Old 06-08-2007, 08:45 PM   #23
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sorry to hijack the thread but i'm just currious.. what happeds if you get those +4 platnums and adjust the gap on those?
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Old 06-09-2007, 12:17 AM   #24
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'03 4.0L, NGK ZFR5N, directly out of the shop manual. I have no engine mods other then on the intake.
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Old 06-28-2007, 01:06 PM   #25
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so the bosch platinums are pretty good? (not the 2,3,or 4, just the one) oh and i have a yj... just noticed this was in the tj section
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Old 06-28-2007, 01:09 PM   #26
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Yeah I like the Bosch too. They should run just as well in the YJ as they do in a TJ.
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Old 06-28-2007, 01:11 PM   #27
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chanpion
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bosch are all good except the 2,3,and 4 tiped ones.
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Old 06-28-2007, 01:24 PM   #28
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alrighty guys, thanks for the info
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Old 06-28-2007, 02:47 PM   #29
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sorry to hijack the thread but i'm just currious.. what happeds if you get those +4 platnums and adjust the gap on those?
The +4 are non-adjustable. They are set from the factory, you'll only mess them up.
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Old 06-28-2007, 04:39 PM   #30
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Wire i just went to Jeep $18.00 + tax plugs were a little more and I belive they ere NGK In the box kinda like our new chevy irridum plugs are Ngk ( i work at a chevy dealer) But Mopar used to be Champion and ac used to be Delco Not anymore I guess...

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