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Unread 09-19-2009, 07:34 AM   #1
xxFLETCHxx
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2004 wj spark plug and coil pack advice?

Looking to change my plugs and pack out. Jeep has just under 74,000miles one it. What are your advices on what products to run with my jeep?? I saw alot of different suggestions.....just not sure.... i have a 2004 4,7l v8

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Unread 09-19-2009, 07:38 AM   #2
Turbonut
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Original plugs and why change the coils if no problems?
http://www.wjjeeps.com/service/sparkplugs.htm
CAUTION: The standard 4.7L engine uses copper core ground electrode spark plugs, they must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, pre-ignition will result.
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Unread 09-19-2009, 07:41 AM   #3
xxFLETCHxx
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good point, that I'll leave alone than......could i run these plugs.........Been reading, it has the same product number as the Mopar ones except it has RC instead of MP
Champion Spark Plug

Part No. 3340
PLATINUM POWER; RC7PYCB4
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Unread 09-19-2009, 07:52 AM   #4
Turbonut
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Quote:
Originally Posted by xxFLETCHxx View Post
good point, that I'll leave alone than......could i run these plugs.........Been reading, it has the same product number as the Mopar ones except it has RC instead of MP
Champion Spark Plug

Part No. 3340
PLATINUM POWER; RC7PYCB4
Get the Champs RC12MCC4 or #439, unless it is a HO, then get the RC7PYCB4 or #3340.
You will see no difference in performance or mileage, so stick waith the OE plugs.
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Unread 09-19-2009, 11:27 AM   #5
michiganmaveric
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I am running the champion single platinums right now. I got them at NAPA and because the cost difference was not that much I went wiht the platinums. The only reason I did is because I don't change my plugs but about avery 75,000-100,000 miles. No real proformance difference.

Leave the coil packs alone. I have over 235,000 miles on mine with no problems.
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Last edited by michiganmaveric; 09-20-2009 at 06:57 AM..
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Unread 09-19-2009, 05:40 PM   #6
wj03grandy
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Use Original Plugs Or Equivilant !!!!!!!!!!!
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Unread 09-20-2009, 09:57 PM   #7
sprocket1200
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standard plugs and leave the coil packs...
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Unread 09-20-2009, 10:59 PM   #8
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That is all.
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Unread 09-21-2009, 12:46 AM   #9
WiCkeDuDe
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I wouldnt let a copper core spark plug go for more than 30k at the most. Not sure how often you like to change them. Im am actually running the ngk iridiums on my 4.7 and I have had no problems at all. Ive heard some like to use autolites in their jeeps as well. I just run ngks on all my stuff so I did it on the WJ as well.
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