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Old 07-04-2012, 08:30 PM   #1
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Talking Sucessful Spark Plug Change and gap 08 Wrangler JK

Well, did my first spark plug change on my 08 JK Wrangler w/ 62,500 miles. After reading all the post on this an other forums, I was hesitant, but went for it anyway. So anyway, here are the tricks and lessons learned from a successful change. BLUF: No problem.

First of all I did all 6 plugs in less than an hour. Wed morning, cold engine. I believe the engine being cold was critical for the success. Each plug came out easily with a 3/8 drive ratchet and 3/4 spark plug socket, 3in extension and 3/8 swivel joint. I started with the notorious #5 plug.

Folded the hood all the way back onto the windshield (this gave lots of room to work), stood on the bumper, placed my right hand on the top of the engine cover and reached under the hoses with my left. Plug came right out. New plug went in without a hitch. Repeated the procedure all the way around. The worst problem was with the sweat dripping down onto my glasses. Be patient, use never-seize, and di-electric grease on the new plugs. As I said, all 6 plugs in less than an hour + clean up.

As for the many questions I've seen on spark plug gap. I used the OEM recommended Champion plug #RE14PLP5 and gapped them to .050 per page 425 of the owners manual.

BTW: Also did break pads on all four wheel this morning as well. these breaks are really simple and did all four wheels in 2 hours including setup and clean up before moving onto the plugs.

All's well and ya'll stay safe

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Old 07-04-2012, 08:33 PM   #2
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Well done!

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Old 07-04-2012, 08:35 PM   #3
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Nice job! Always good to do it yourself.
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Old 07-05-2012, 05:38 AM   #4
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Good job, I will be doing mine at 50k

How did the factory gaps look?
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Old 07-06-2012, 08:49 AM   #5
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I checked each one against my 0.050 gage. Look fine other than natural electrode wear. Likely they had proper gap from the factory
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Old 11-27-2012, 02:16 PM   #6
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Thanks for this thread, I did mine this morning.. It would have taken just an hour had it not been for the middle plug on the passenger side. First, I could not get the damn wire off, I know.. wtf.. and then I found it real cumbersome to turn that one plug out. On the other hand, the one that I feared the most was just as easy as any on the driver side.

One thing I'm concerned about though is how easy one of plug wires comes off and on and when you wiggle it (when attached) it has a lot of play compared to the other five. Took it for a drive and didn't notice any difference in how it drove or idled. Thinking I should maybe replace the wire though in which case I may as well do all of them, I imagine that they don't sell them separately.

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