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Old 04-15-2006, 12:37 PM   #1
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Spark plug question .

I'm new to Jeeps , what's plug do y'all use . I have a 98 tj 4.0 , fsm says to use rc12lyc , i'd like to change plugs today if it ever stops raining Comments ?

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Old 04-15-2006, 12:50 PM   #2
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i run the just plain ol' autolite plugs and have had no problems. i've run the more expensive bosch plugs and didn't notice any difference. alot of guys suggest champion truck plugs. it seems jeep motors prefer the simple plugs to all the expensive stuffs.

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Old 04-16-2006, 08:59 PM   #3
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Champion Truck plugs are commonly recommended but I get the same good performance with Autolite's single-tipped platinum (platinum on just one side of the gap) coated plugs that easily outlast the Champion non-platinum Truck Plugs by 3-4X. Double-tipped platinum plugs (platinum on both sides of the gap) have no advantage over single-tipped platinum plugs where the older 4.0L engines go that still have a distributor.
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Old 04-17-2006, 09:51 AM   #4
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Plain ol' Autolite's here as well.....have never noticed any differnce in the past with the more expensive plugs.
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Old 04-23-2006, 11:03 PM   #5
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I use the Champion 4412 plugs with good results
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Old 04-04-2007, 12:26 AM   #6
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any one run platinum +4 (4 prongs)? Any luck or comments?

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Old 04-04-2007, 12:38 AM   #7
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any one run platinum +4 (4 prongs)? Any luck or comments?
I wouldn't run those unless you have coil packs or a high energy igintion system...

I run Bosch Platimun plugs, love'em!
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Old 04-04-2007, 12:43 AM   #8
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there was a demo in my local auto store of those vs regular plugs.. i love how those make 4 sparks compared to the 1 regular spark.. also it showed that they require less voltage to jump since there is more surface area for the spark to jump to.

Thanks AzTJ

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Old 04-04-2007, 01:43 AM   #9
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champion copper plugs, mopar motors love champions
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Old 04-04-2007, 08:37 AM   #10
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I run Bosch too, love 'em.
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Old 04-04-2007, 09:42 AM   #11
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Old 04-04-2007, 11:31 AM   #12
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I ran the +4's for about 6 months now. I run these plugs in truck and i was impressed with them. ON the Jeep though it has been a different story. I started having a random idle...jumping from 450-1200 rpm and figured it was tps, AIC, or some other nonsense. After changing everything i decided to change the plugs over to champion. Pulling the bosch ones out i was suprised after 6 months they were completely fouled. After the champions went in it idled as smooth as ever. I did a lil research and several people say the coil packs dont generate enough power to efficiently spark the +4s. Guys with the distributor may not have this problem but they didnt do well in my jeep. I torture mine and put it through hell keep in mind, but jus figured i would share this with ya.
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Old 04-04-2007, 01:22 PM   #13
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I installed NGKs a few weeks ago and they seem fine so far. I think the TJ had the original Champions in it you could throw a cat thru the gap and they were burned up. It has 77,000 miles on it.
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Old 04-04-2007, 06:44 PM   #14
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Where is the best place to get champions?
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Old 04-04-2007, 06:44 PM   #15
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i have the +4's for i'd say atleast 3+ months now with no problems. I've ran 2 cans of seafoam past them too without issues. i was extreamly impressed when i first put them in, but my next set will be the E3's i think. the +4's are the only set i've tried so far, but ill give a comparison as soon as i need to change them again.
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Old 04-04-2007, 06:53 PM   #16
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oooo the E3s look sexy too bad thats the first time i heard of them.. ill take a look when i go to my local auto store Do you still have to set the gap when you get +4? They do look like they are not set.

http://www.quadratec.com/products/55114_107.htm
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Old 04-04-2007, 10:25 PM   #17
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Quote:
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Do you still have to set the gap when you get +4? They do look like they are not set.

http://www.quadratec.com/products/55114_107.htm
No - they are preset and should not need to be gapped, because there really isn't a good way to. Usually the guys at the auto part stores are trying to BS you into buying them for the higher price. I'm gonna try them E-3's when its tune up time. But anything "platimun" should be fine. I'm also thinking of getting an MSD Blaster Coil and bigger 9-10mm wires for the hell of it.
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Old 04-04-2007, 11:17 PM   #18
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which MSD blaster coil (#?) is for Jeep TJ's? is it a universal part because neither summitracing nor quadratec had the actual blaster listed for TJ's
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Old 04-04-2007, 11:49 PM   #19
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well keep us updated with what you do since i'm also interested if msd coil will make such of a difference vs the stock unit
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Old 04-05-2007, 12:27 AM   #20
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which MSD blaster coil (#?) is for Jeep TJ's? is it a universal part because neither summitracing nor quadratec had the actual blaster listed for TJ's
MSD #8228 - I know it will work for '97 TJ's with 4.0L but I don't know about '98-Up. AutoZone and maybe Checker cary them in stock, so you might be able to go there and check one out first hand to see if it would fit. Accel does have a coil that is listed for 91-99 YJ/TJ - LINKY, but 98-99 will need an adapter for it to work... I think it has to do with the input pins to the coil itself, either 1 or 2. But I'm going to be getting the MSD 8.5mm wires when I upgrade the coild and plugs.
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Old 04-05-2007, 11:01 AM   #21
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Quote:
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any one run platinum +4 (4 prongs)? Any luck or comments?

i ran the bosch platinum 2+ ... what a waste. they were the correct heat range for the engine, but i still burt up 3 of them in 10K miles ... went with autolite and have been running them for 20K without a hitch .... the older engines really dont like the higher end plugs for one reason or another ... newer engines like the higher end plugs though ....
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Old 04-05-2007, 11:04 AM   #22
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Quote:
Originally Posted by Mudweiser View Post
I ran the +4's for about 6 months now. I run these plugs in truck and i was impressed with them. ON the Jeep though it has been a different story. I started having a random idle...jumping from 450-1200 rpm and figured it was tps, AIC, or some other nonsense. After changing everything i decided to change the plugs over to champion. Pulling the bosch ones out i was suprised after 6 months they were completely fouled. After the champions went in it idled as smooth as ever. I did a lil research and several people say the coil packs dont generate enough power to efficiently spark the +4s. Guys with the distributor may not have this problem but they didnt do well in my jeep. I torture mine and put it through hell keep in mind, but jus figured i would share this with ya.
werd. tons of jeeps have problems with the bosch plugs .. its not just the 4+ .... for the older engines -2002 a regular resistor type plug really si the best thing for the engine.
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Old 04-05-2007, 02:21 PM   #23
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For some obscure reason I read a few months ago but forget what it is, there are a number of engines... Jeep included... that don't run well on Bosch's Plus4 and Plus2 plugs. Certainly lots of negative experiences with them on the 4.0L and 2.5L. I did a Yahoo search and found lots of discussions on the problems with the Plus4 and Plus2 plugs so Jeeps aren't the only brand that don't like that particular plug. One of those discussions had a Bosch engineer's comments on what the likely issue was for some engines, I wish I could find that thread now but I can't.

For me, I just avoid all such gimmick plugs which include the Plus4, Plus2, Splitfire, Iridiums, etc. I've had great luck with my Autolite Platinums but you even need to be careful with which platinums you use, if you want the extended life platinum plugs offer. Newer distributorless 4.0L engines are fussy and can only use either double-tipped platinum (platinum on both sides of the gap) or conventional non-platinum plugs. Using a single-tipped (platinum on just one side of the gap) platinum plug on a newer distributorless 4.0L engine will cause problems.

Older 4.0L engines with distributors can run single or double-tipped platinums without problem though there's no benefit to the more expensive double-tipped platinum plugs on that type of ignition system.
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Old 04-06-2007, 05:47 PM   #24
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Any one had experience with the E3 Plugs?
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Old 04-06-2007, 11:31 PM   #25
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....Iridiums......
Iridiums are great! Especially for high performance engines with high energy ignition systems(imports with multiple coils packs and upgraded MSD/Accel systems)... They will last a looong time. A friend ran them in his Audi S4 for well over 50k and it didn't even look like they were used!
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Old 04-07-2007, 01:42 AM   #26
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Iridiums are great! Especially for high performance engines with high energy ignition systems(imports with multiple coils packs and upgraded MSD/Accel systems)... They will last a looong time. A friend ran them in his Audi S4 for well over 50k and it didn't even look like they were used!
I thought we were talking about Jeeps here.

On the other hand, my plain-Jane single-tipped Autolite platinums looked nearly new with 66,000 miles on them, all still with the original .035 gap.
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Old 04-07-2007, 01:49 AM   #27
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Sorry - but yes, I believe that single tipped plats are the best for our 4.0L/2.5L Jeeps

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