Did a tune up on the 07 JK yesterday. It has, (sorry, it's not a she and has no name), 102k miles on it. The manual says to change plugs and wires at 100k.
Do not wait that long. Jeep threw in the cheapest set of Champions they could find when it was new. Gap new at .045. Gap at replacement? .11. I'm surprised it passed smog last month.
I put in a set of OEM wires and Bosch Super Platinum plugs that will last an other 100k miles. The engine idles smoother and seems to make a little more usable HP but I'm guessing that's in my head only.
Also replaced the rear rotors and the high speed shimmy when braking is gone.
Bad new is that the drives side rear axle seal is leaking.
What a wonderful thing this unlimited power train warranty is. Called the dealer and yes, it's covered. I am never selling this Jeep.
I did my plugs at 65k and they were ready for replacement!
08 JK 23S - Colorado Jeep Club No. 204
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Yuck, I should probably do mine...79,000 miles and lots of hours crawling in Utah and Colorado...
2007 White Jeep Wrangler X-auto, black freedom top, 15x8 Pro Comp Rock Crawlers, 33x12.5x15 BFG KM2s, Superchips Flashpaq, 2" OME Spring Lift, Bilsteins, Rusty's Adjustable front and rear trac-bar, JKS Quicker Disconnects, Rusty's adjustable lower control arms (front and rear), PolyPerformance adjustable upper control arms (front and rear), OEM Rubicon Rock Rails, Finishlinewest Stonehenge Series rear bumper, Smittybuilt winch, Body Armor Front High Clearance Bumper w/ KC Highlights mounted, Roadmaster towbar, Valley 2" receiver hitch, Skid Row Engine Transmission skid, sPod switching system, KC Highlights windshield mounted lights, Delta replacement non-quadbar xenon headlamps, and Bestop saddlebags-Member of the United Four Wheel Drive Association and Blue Ribbon Coalition, †John 3:16†
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Had to do a short trip for the company yesterday. Filled up and spent 60 miles on the freeway. Filled up when I got back and got a honest 20 mpg on that short trip. I think it's an improvement. It certainly does run better, that I've noticed right away.
The stock plugs in my 07 were not platinum. They were cheap champions. Check the model number on yours. Yes, oil will foul a plug but it will not erode an electrode. My plugs were very clean coming out at 100k but were shot. Gap was over .1
I checked the plugs on my 2009 Sahara at 46,000 and they were already so far gone I couldn't imagine it was operating on all six cylinders. The original owner never took it offroad, she was a mall warrior so I know it's not the result of crawling. I installed the best plugs I could find and the fuel economy immediately jumped (which tells me the spark plugs were in fact causing trouble). It went from 16- to 20+. I expect to continue to upgrade things but was surprised to find modern spark plugs going out so quickly.
I am pretty sure the stock plugs in my 07 JK were RE14PLP5 and that is also what I got when I went to get new ones. If you look up that number you will find that it is a cheap champion plug (3.99ea) that has a PLATINUM electrode. The box says platinum on it too. Maybe it is all a lie and they aren't really platinum plugs, I just figured since Champion calls them platinum and the box says platinum that they were in fact platinum?
Are there better plugs out there? I have no idea but I do know that these champions are more expensive than the plugs my Hemi eats (NGK Plug) and they recommend changing those every 40k.