IL 6 Tune-Up - JeepForum.com

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post #1 of 16 Old 02-23-2008, 11:16 AM Thread Starter
cweb
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IL 6 Tune-Up

I'm planning on changing the sparkplugs on my '00 JGC Laredo in the next month or two. I'm not a mechanic by any means, I can change my oil, replace brake pads and such, will this be a difficult task? Anything special I need to watch for while doing it? Also, any recommendations on plugs? The more money I spend on plugs they better off I am a true statement?

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post #2 of 16 Old 02-23-2008, 11:21 AM
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Easy task, esp. on the 4.0. I would rather do it than brakes. Use only the stock replacement plugs for best results. I think they are champion truck plugs, not sure.

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post #3 of 16 Old 02-23-2008, 08:45 PM
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The distributor cap is labeled for the #1 cylinder and the intake manifold has the firing order stamped on it. The rotation of the rotor is clockwise. Thatís all the info necessary to do the job other than paying attention to details.

You always replace the cap, rotor, wires, & plugs at the same time (every 30,000 miles)

Cheers Steve

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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #4 of 16 Old 02-23-2008, 09:42 PM
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Accel Ignitions offers a kit (TST16) for the 4.0 up to 1999. They don't list anything for 2000 and up 4.0, but I'm sure there is something available. I'd listen to grease and do wire's,cap,rotor at the same time. It's in-expensive to do as a package.

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post #5 of 16 Old 02-23-2008, 09:49 PM
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Quote:
Originally Posted by greasefingers View Post
The distributor cap is labeled for the #1 cylinder and the intake manifold has the firing order stamped on it. The rotation of the rotor is clockwise. Thatís all the info necessary to do the job other than paying attention to details.

You always replace the cap, rotor, wires, & plugs at the same time (every 30,000 miles)
Quote:
Originally Posted by Vestjam View Post
Accel Ignitions offers a kit (TST16) for the 4.0 up to 1999. They don't list anything for 2000 and up 4.0, but I'm sure there is something available. I'd listen to grease and do wire's,cap,rotor at the same time. It's in-expensive to do as a package.
He doesn't have a distributor boys. Coil packs directly over the plugs from 2000 on

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post #6 of 16 Old 02-24-2008, 05:26 AM
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Quote:
Originally Posted by tennesseewj View Post
He doesn't have a distributor boys. Coil packs directly over the plugs from 2000 on
Thanks for pointing that out

Cheers Steve

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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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post #7 of 16 Old 02-24-2008, 08:47 AM
tennesseewj
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Quote:
Originally Posted by greasefingers View Post
Thanks for pointing that out
No problem

To the OP:

Get the stock plugs and make sure they're gapped correctly. The gaps and plug types can probably be found on here, but you might as well go ahead and invest in a Haynes or Chilton manual. It will be easier to find the information and they are not expensive. It is not as good as an FSM, but it is plenty sufficient for plug changes, brakes, and those type projects.

If you haven't already looked under your hood, it might be a little different than what you're used to seeing. There is no distributor and the spark plug locations won't be blatantly obvious as they are under the coil rail. The Haynes/Chilton manual has pictures of this. Also, get a torque wrench if you don't already have one so you get the correct torque specs on the coil rail bolts and plugs.

That's about it except for keeping an eye for badly fouled plugs, which could well be a sign of bigger problems.

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I was bored so I forded the river. No oxen were lost.
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post #8 of 16 Old 02-24-2008, 11:12 AM
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It's kind of a PITA to unclip the coil pack rail, so dont. Just unbolt the 6(?) bolts and pull away the rail from the plugs and place it up and out of the way. Thats what i did and it was easy. Champion truck plugs are the way to go. Dive in and get to know your jeep. Youll be fine.

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post #9 of 16 Old 02-24-2008, 11:12 AM
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Quote:
Originally Posted by greasefingers View Post
Thanks for pointing that out
To me too... all makes sense now.

Sorry for confusing you with the bad info.

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post #10 of 16 Old 02-28-2008, 08:14 PM
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Quote:
Originally Posted by tennesseewj View Post
He doesn't have a distributor boys. Coil packs directly over the plugs from 2000 on
Actually...it's from 1999 on.
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post #11 of 16 Old 02-28-2008, 08:45 PM
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Quote:
Originally Posted by pigoo View Post
Actually...it's from 1999 on.

I was thinking that too and then for some reason when I pulled up a site to double-check it said 2000 on. I thought it was odd but I wasn't too worried about being exact since he didn't have one either way

Should have just gone with what I knew in the first place......

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You need to learn, there are 3 things that all JF members must like beside Jeeps:
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Quote:
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I was bored so I forded the river. No oxen were lost.
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post #12 of 16 Old 05-17-2008, 10:31 AM
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4 bolts on coil pack. Hope you have better luck than I had. Replaced w/ champion truck plugs and for some reason the PCM took a dump at the same time. Had to tow to 2 shops for repair and still don't have it back$$$$$$.
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post #13 of 16 Old 02-05-2010, 07:29 AM
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I just did this the other day, I had a P0303 code and it was running rough, so I went and got some Champion plugs, the coil has 4 long bolts, remove and just pull back gently on the coil rail and the plug covers will come right out, I found it to be relatively painless, it also fixed the rough idle issue.
Good luck,
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post #14 of 16 Old 02-05-2010, 02:37 PM
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I'll toss in my two cents here:

For a little extra coin, buy replacement coil boots to go on the end of the coil pack (you'll need 6 of them). Sitting right on top of the engine they are exposed to some pretty extreme temps and get brittle over time and can crack or tear.

I've had several customers mistake a misfire for a bad coil pack and all they've needed was new coil boots. The rail style coil pack retails for close to $200, but the boots should only set you back around $30 for all six.

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Quote:
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It is what Jeeples has *PARTIALLY* stated.
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post #15 of 16 Old 02-05-2010, 03:06 PM
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Quote:
Originally Posted by pigoo View Post
Actually...it's from 1999 on.
Quote:
Originally Posted by tennesseewj View Post
I was thinking that too and then for some reason when I pulled up a site to double-check it said 2000 on. I thought it was odd but I wasn't too worried about being exact since he didn't have one either way

Should have just gone with what I knew in the first place......
To clear this up...Its '99+ in WJ's and 2000+ for all the other 4.0's. The WJ's got the new ignition system 1 year before the XJ and TJ.

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