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Unread 08-11-2007, 11:38 PM   #1
FlipFlop425
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WJ Spark Plugs

I want to get some platinum plugs. So I went to the store and there are so many. I have an 04WJ 4.0 . I saw the Autolite ones and the Bosch ones with the 4 contacts. What is really the difference besides about $8 a plug? I need some assistance. The reason I want to change is I am starting to get a knock and poor gas mileage, my fuel pump is new so I know its ok. I just hope its not injectors. thanks

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Unread 08-12-2007, 04:54 AM   #2
michiganmaveric
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Do not bother with platinum plugs. Get champion copper plug's, I put about 80,000 miles on them before I change them.
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Unread 08-12-2007, 10:56 PM   #3
FlipFlop425
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But doesnt platinum burn fuel better?
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Unread 08-12-2007, 11:37 PM   #4
BucYouUp68
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Quote:
Originally Posted by michiganmaveric
Do not bother with platinum plugs. Get champion copper plug's, I put about 80,000 miles on them before I change them.
What he said, I have tried all types. Get the Champions.
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Unread 08-12-2007, 11:48 PM   #5
horatio102
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Quote:
Originally Posted by FlipFlop425
But doesnt platinum burn fuel better?
Nooooooooooooooooo

Platinum lasts longer at the slight expense of not as much spark.
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Unread 08-13-2007, 12:28 AM   #6
5.9 ANDY
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copper sparks better??
that supprises me!!
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It's threads like this that make me wonder why people lift there jeeps
its comments like this that make me wonder why some people are jerks.

build thread:http://www.jeepforum.com/forum/f197/...ndard-1056365/
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Unread 08-13-2007, 02:54 AM   #7
-Joe-
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more voltage = better spark


stick with the stock recomended plugs
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Unread 08-13-2007, 09:49 AM   #8
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IF you decide to go with platinums DO NOT buy the gimmick plugs with multiple contacts. They are useless. Electricity will always follow the path of least resistance so no matter how accurately they manufacture the plugs, one contact is always closer than the others and therefore only one will have spark. In many cars they require platinum plugs as they were designed for them. With trucks (especially chrysler) most just use standard copper from the factory. plat plug upgrades will never give you much of a performance boost, just buy a better quality copper plug.
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Unread 08-13-2007, 10:28 AM   #9
nierace
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Go with the copper ones...
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Unread 08-13-2007, 11:02 AM   #10
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The reason some cars specify platinum plugs is that they last longer. I know for Subaru dohc engines the plugs are horizontal and a MAJOR hassle to change due to there only being ~2" space between the heads and the unibody. The SOHC ones are angled, and way easier to change.
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Unread 08-13-2007, 11:15 AM   #11
nierace
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Luckily no body here is dumb enough to buy a subaru






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Unread 08-13-2007, 11:19 AM   #12
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My 01 Impreza went to the shop 1 time for a ticking noise from the heater fan. My 98 Impreza went to the shop 1 time for gear oil dripping out the splines on the front diff onto the exhaust. Both of those were bought new, and I put 33k or so on the 98 in a year and 60k on the 01 in 2.5 years. My 99 WJ (first one) was in the shop about 20 times in the first year I owned it.

I'm just sayin....
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Unread 08-13-2007, 06:33 PM   #13
Gsmagnum
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I have another thread due to a missfire in the engines section.
I put AC plugs in my friend's Jeep as Champions weren't available. My preference would have been Champion Platinums because I have had good luck with them and because it is not my ride so who knows when they would be done next.
The other available choices were Autolites or Bosch.
The origional plug for this engine is actually an NGK. The origional plugs in that 4.0 were badly worn with 66,000 mi on them.
I will have to consider the coppers for my own rides in the future.
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Unread 08-13-2007, 07:10 PM   #14
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Quote:
Originally Posted by nierace
Luckily no body here is dumb enough to buy a subaru






One of the finest vehicles ever produced. I'm a Subaru believer. It's ok I don't take it personal.
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Unread 08-14-2007, 07:52 AM   #15
FlipFlop425
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How do Autolite plugs compare to Champion?
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