I'm about to change plugs in my 01 XJ Sport. It has the H.O. 4.0 and calls for the RC12ecc. I see folks say there are several different plugs you can run. When it is warmed up and idleing I feel a slight miss. What are you guys opinions on best plug to run for daily driving?
I usually get the copper plus ones from AutoZone and they last me for awhile and make the engine run good. They are $2.00 a plug. But plug wires make the difference. Have found that good plug wires are better.
__________________ 1997 XJ Sport
6.5" with 31's
Built to CRAWL BUILD THREAD IG: zack_hstadt
NGK's Gotta GO.....My Jeep will not get to operating temperature. I know it is cool outside, but it should at least get to 210 degrees and it isn't ...Probably around 180. I can lliterally see the gas needle moving. Even with my old plugs I had better gas consumption. Guess I will put new plugs like I had back in there. Were the NGK's suppose to be used with the coil packs our distributer model XJ's