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Old 07-11-2010, 09:50 PM   #1
Sierra8's Avatar
Join Date: Apr 2010
Posts: 147
Spark plug replacement?

I tow pretty frequently with my 4 door JK and just replaced the stock plugs at 50,000. The factory plugs looked like they burned cleanly but the center electrode on all 6 of the factory champion plugs looked worn down. Anyone else replace their plugs yet in their JK? Regular copper plugs weren't available at the ol' Autozone so I put in Autolite platinums for 2.99 a piece. The main difference I noticed after replacing is the acceleration is smoother than before from 1000 - 3200 rpm. I do run 4.88 gears and turn a lot of rpm so I guess it's possible I'm burning up plugs quicker than others.

I usually don't put in platinum plugs in any of my cars unless they're installed OEM. I guess the JK's came with Champion platinum plugs?

Also had to dig awhile on the net but spark plug gap at .050 seem right? I couldn't find the gap on any of the stickers under the hood or in the owners manual.

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Old 07-12-2010, 08:57 AM   #2
Join Date: Mar 2009
Location: Upstate/Eastern NY
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As for the plug gap, could've saved you a lot of time- it's in the back of the book They don't index it, but check under specifications- Mark W.
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