Spark Plug Gap

06 KJ Sport · **Posted:** Sun Jul 20, 2008 1:36 pm

Does anybody know if you have to gap spark plugs on newer vehicles still?? If so what is the gap for the 2006 3.7L??

meh_kick · **Posted:** Sun Jul 20, 2008 1:40 pm

06 KJ Sport wrote:

Does anybody know if you have to gap spark plugs on newer vehicles still?? If so what is the gap for the 2006 3.7L??

Usually new plugs, when purchased for the 3.7, are gapped already.

If not, they need to be set to 0.040".

jeepkj02 · **Posted:** Sun Jul 20, 2008 1:45 pm

meh_kick wrote:

06 KJ Sport wrote:

Does anybody know if you have to gap spark plugs on newer vehicles still?? If so what is the gap for the 2006 3.7L??

Usually new plugs, when purchased for the 3.7, are gapped already.

If not, they need to be set to 0.040".

It's always a good idea to check your gap. Don't forget to put anti-seize on the treads.

tjkj2002 · **Posted:** Sun Jul 20, 2008 3:14 pm

Do not use a metal gapper with platinum plugs or iriduim plugs,you will damage them.They make special plastic coated gappers for those plugs.Not all plugs come pre-gapped,that goes for the ones for the 3.7 plugs also, and the ones that due can be out of specs from how they where handled,always check the plug gap before installing.

The plug gap is stated on the emmision sticker located on the upper radiator support under the hood of your KJ.

jeepkj02 · **Posted:** Sun Jul 20, 2008 3:39 pm

tjkj2002 wrote:

The plug gap is stated on the emmision sticker located on the upper radiator support under the hood of your KJ.

Mine says 0.035", but everyone on here says to gap them at 0.040", so that what I always gap them at.

tjkj2002 · **Posted:** Sun Jul 20, 2008 3:41 pm

jeepkj02 wrote:

tjkj2002 wrote:

The plug gap is stated on the emmision sticker located on the upper radiator support under the hood of your KJ.

Mine says 0.035", but everyone on here says to gap them at 0.040", so that what I always gap them at.

It will be different for different years.

Mine say's gap the plugs at 0.042",mines a '02 KJ(biuld date of Feb 14th '02).

Xodius · **Posted:** Mon Jul 21, 2008 3:39 pm

tjkj2002 wrote:

jeepkj02 wrote:

tjkj2002 wrote:

The plug gap is stated on the emmision sticker located on the upper radiator support under the hood of your KJ.

Mine says 0.035", but everyone on here says to gap them at 0.040", so that what I always gap them at.

It will be different for different years.

Mine say's gap the plugs at 0.042",mines a '02 KJ(biuld date of Feb 14th '02).

He knows what he is talking about...listen to him.

I did my plugs about...what...4 months ago. They were in dire need, lol. 2002 with original plugs and 80,000 miles, lol. Oh and the plugs I bought whcih said they were pregapped...were not. They were way off!

tommudd · **Posted:** Mon Jul 21, 2008 4:44 pm

Xodius wrote:

tjkj2002 wrote:

jeepkj02 wrote:

tjkj2002 wrote:

The plug gap is stated on the emmision sticker located on the upper radiator support under the hood of your KJ.

Mine says 0.035", but everyone on here says to gap them at 0.040", so that what I always gap them at.

It will be different for different years.

Mine say's gap the plugs at 0.042",mines a '02 KJ(biuld date of Feb 14th '02).

He knows what he is talking about...listen to him.

I did my plugs about...what...4 months ago. They were in dire need, lol. 2002 with original plugs and 80,000 miles, lol. Oh and the plugs I bought whcih said they were pregapped...were not. They were way off!

WOW

80,000 on the original plugs?????????Did it still run? I do mine every 25/30,000 easy to do, cheap way to make sure that the engine is still running its best etc.

jeepmedic · **Posted:** Tue Jul 22, 2008 11:26 am

I changed mine @ 35 K and they were worn to .08. The new ones got gapped @ .040... The libby runs a little better now..

06 KJ Sport · **Posted:** Tue Jul 22, 2008 4:48 pm

I ended up changing out the plugs yesterday, I did not check the gap of the old ones. The Libby runs a LOT better know.
28000 miles and I put Densco's in.

iambob · **Posted:** Tue Jul 22, 2008 9:38 pm

Your emission sticker under the hood will tell you the proper gap as well. When I replaced my originals, I checked the gap on those NGK's with a telephone book, WOW, I needed half the book!

06 KJ Sport · **Posted:** Wed Jul 23, 2008 2:11 am

Yes I was not real impressed with the stock NKG's. The gap looked alot bigger than it should've. I did look at the sticker under the hood, and the weather stripping wore the letters and numbers off!! :shock:

Spark Plug Gap

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