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Unread 08-07-2013, 01:29 PM   #1
rirrgang
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Plugs at 100k?

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.

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Unread 08-07-2013, 07:59 PM   #2
Jiblet
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What a wonderful thing this unlimited power train warranty is. Called the dealer and yes, it's covered. I am never selling this Jeep.
Win!
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Unread 08-07-2013, 08:02 PM   #3
Butterjeep
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I feel 100k is too long for spark plugs too. Especially in Jeeps where the engine hours far exceed the average (think of crawling at 2-3mph in 4 lo all day). I will do my plugs at 50k.
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Unread 08-07-2013, 08:09 PM   #4
RockyClymer
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I did my plugs at 65k and they were ready for replacement!
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Unread 08-07-2013, 09:15 PM   #5
Prot
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Did you see any improvement in fuel economy at all? I know it's a Jeep, but I am curious anyway.
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Unread 08-07-2013, 10:05 PM   #6
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Yuck, I should probably do mine...79,000 miles and lots of hours crawling in Utah and Colorado...
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Unread 08-08-2013, 08:09 AM   #7
rirrgang
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Originally Posted by Prot View Post
Did you see any improvement in fuel economy at all? I know it's a Jeep, but I am curious anyway.
It's only been a couple of days. My commute is only 5 miles so it will be a little tough to get numbers until the weekend.
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Unread 08-08-2013, 12:16 PM   #8
Godholio
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You should at least pull and check your plugs halfway through the interval.
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Unread 08-08-2013, 02:12 PM   #9
SubAtomicGenius
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I agree to change the plugs out more often than the recommended interval.

I've never been fussy about "platinum" plugs or the like. Those pin-shaped electrodes seem so gimmicky and mickey-mouse.
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Unread 08-10-2013, 08:01 AM   #10
rirrgang
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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.
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Unread 08-10-2013, 09:03 PM   #11
duneslider
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The stock plugs are platinum but mine were toast at under 50k, although my first engine was an oil burner so I am sure that played a role in that too.

Plugs are cheap and easy to do so why wait.
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Unread 08-11-2013, 08:44 AM   #12
rirrgang
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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
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Unread 08-11-2013, 09:26 AM   #13
CombatDiver
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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.
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Unread 08-11-2013, 01:35 PM   #14
SoK66
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Great info. Never underestimate the ability of a car company to use crap components and hope you won't notice.

On my former trail Jeep (94 YJ) I changed plugs, wires, cap and rotor @ 30k intervals. That was about 2x the recommended interval. May be worth following that plan on JK.
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Unread 08-12-2013, 07:49 AM   #15
duneslider
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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.
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