Jeep Garage  - Jeep Forum banner

4.7l wj spark plugs..

23K views 13 replies 9 participants last post by  Scottina06 
#1 ·
wjjeeps.com says they need to stay OE... Copper plugs or preignition will start.

i work at napa, most of my co workers, and some of the mechanics i deliver parts too say that it won't matter if i throw in platinum or double platinum like i want too. so they will last a little longer.

any input? i'm doing them this weekend.

along with homemade cai =]
 
#2 ·
Platinum has less conduction than copper... making it last longer. Only thing better than copper to conduct is Silver. Stick with OEM. They have it that way for some reason or another lol

Ive heard alot about 4.7's and 5.7's being pretty picky and not liking platinums in them.
 
#4 ·
Yeah i've heard of people having issues with Platinum, I would use the Champion Copper core but Autozone did not have them in stock so I went with another brand but they are basically the same thing as the Champions, copper core .40 and they have worked perfect for me. I think I paid 1.40 each? I think as long as you stick with a .40 copper core you should be good.
 
#11 · (Edited)
Well my computer at work... I work at napa. It says the gap is .40 but wjjeepss sayys it's .35? Input? And I'm gonna throw copper in there, prob autolite, I'll let you know how they work out.

How long did it take all of you to do them with the 4.7??
With the right tools, it's a 30 min job.

Edit: The guide on WJjeeps is excellent as far as getting the correct extensions, etc. I swear by it.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top