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Unread 12-14-2008, 02:54 PM   #1
tattoocharger
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1999 WJ 
 
Join Date: Aug 2008
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spark plugs 99 gc

is there a write up with pictures somewhere???? always used to vehicles with spark plug wires, not used to this newfangled crap

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Unread 12-14-2008, 03:11 PM   #2
Kruzin
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Plugs are the same as they've always been....just have coil packs on em now.
Grab the CP, yank em off, there's yer plugs....
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Unread 12-14-2008, 06:45 PM   #3
cmonson
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Coil packed plugs are even easier to change (no wires to deal with). Cheaper as well, as most of the time the coil packs last forever (knock on wood) and you don't have to replace wires as part of a tuneup.
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Unread 12-14-2008, 07:43 PM   #4
txtumbleweed
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Read All About It - And Bookmark the HomePage

http://www.wjjeeps.com/service/sparkplugs.htm
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Unread 12-14-2008, 08:07 PM   #5
mailforjon
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Quote:
Originally Posted by cmonson View Post
Coil packed plugs are even easier to change (no wires to deal with). Cheaper as well, as most of the time the coil packs last forever (knock on wood) and you don't have to replace wires as part of a tuneup.
the coil packs and plugs on the 4.7 are a nightmare to replace. especially on the rear passenger side. they might be considered "cheaper" if you buy the generic packs at autozone or where ever, but i think they are about $40-$50/each if you get a genuine mopar coil pack. multiple that by 8, and thats quite a bit more than any set of premium wires ive ever bought.

regardless, if you are swapping out plugs/packs, be very careful pulling the coil packs out. when i replaced mine at 115k (and im not sure if they had ever been done before that), they were seized in the cavities pretty badly. i ended up accidentally cracking the bottom part that surrounds the spark plug on several of them. this process was even more tedious on the rear passenger side.
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Unread 12-14-2008, 10:03 PM   #6
20jeepwj00
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To change the 4.7 plugs,remove the air intake at the throttle body,remove the 10mm bolt holding the oil dipstick tube and bend it slightly out of the way,using a screw driver lightly push down on the locking tab on all the coil pack connectors and pull them off,remove the 10mm bolts on each coil pack and pull up on the coil to remove it,ive found the easiest way to remove the plugs is with a 5/8 swivel plug sock and and extension,the rear on the pass side is a little tircky,but everything usually comes apart without problem.
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Unread 12-15-2008, 11:33 AM   #7
cmonson
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The I6 is very easy to change and all plugs are very easily reached. The V8 is a different story.
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Unread 12-15-2008, 11:50 AM   #8
JG_Canuck
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^on the 4.7L, the rear plug on the passenger side is the only one that presents any "difficulty". All the rest are very easy to get to.
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