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Old 02-03-2010, 10:36 PM   #1
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2006 Wrangler 4.0 Tune-Up Question

Hi, I have a 2006 Wrangler X with the 4.0 and 6-speed tranny, that I am about to do a tune up on and just have a question about the ignition system. Does this model have plug wires? or some other type of ignition system? I glanced under the hood and noticed a plastic rail over the plugs, is this just a plug wire cover or some other type of ignition system? Also, do any of you have any recommendations for a higher performance plug wire or ignition system that I could change out during a routine tune-up? Thanks for the info!

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Old 02-03-2010, 10:43 PM   #2
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Quote:
Originally Posted by georgiakld112 View Post
Hi, I have a 2006 Wrangler X with the 4.0 and 6-speed tranny, that I am about to do a tune up on and just have a question about the ignition system. Does this model have plug wires? or some other type of ignition system? I glanced under the hood and noticed a plastic rail over the plugs, is this just a plug wire cover or some other type of ignition system? Also, do any of you have any recommendations for a higher performance plug wire or ignition system that I could change out during a routine tune-up? Thanks for the info!
I believe your 06 is the same as my 02...it doesn't have wires. Well it does technically, but you don't replace them. It has a coil-rail system...so when you do a tune-up, you replace the entire coil rail (looks to be between $100-200...I think closer to $100) and then the plugs. That's it.

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Old 02-03-2010, 10:45 PM   #3
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Don't replace the coil rail, just the plugs.
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Old 02-03-2010, 10:47 PM   #4
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Thanks, Literally 2 minutes after I posted I researched a little more and realized it's a coil rail system. Are there any aftermarked upgrade coil rails on the market?
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Old 02-03-2010, 10:48 PM   #5
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Quote:
Originally Posted by JeepnJim View Post
Don't replace the coil rail, just the plugs.
Well, yeah...if you're just doing a basic tune-up, that's fine. But for a complete tune-up, you might as well do the rail too.

I don't know what the rails are rated for mileage wise...but I definitely wouldn't be changing it out very regularly. If it were me based on what I personally am comfortable with when it comes to preventative maintance, I'd prolly do the full rail every 50-75k miles if I didn't have problems with it sooner.

Edit: Sorry can't help ya on upgrades...these engines seem to run really good as it is, I wouldn't worry bout upgrading the ignition system. Interesting enough, I really don't notice many threads regarding engine mods on this forum. My old Dakota forum was a whole nother story...we were constantly discussing new throttle bodies, roller rockers, cams, etc. Most you usually see on here are discussions about exhaust...lol
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Old 02-03-2010, 10:48 PM   #6
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Yes, but you don't need one. The stocker is just fine.
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Old 02-03-2010, 10:53 PM   #7
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Thanks for the info guys
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Old 02-03-2010, 11:01 PM   #8
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So while this discussion is up at the top, can anyone chime in on the average lifespan of the factory coil-rail for those of us who like to do preventative maintenance?
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Old 02-03-2010, 11:01 PM   #9
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Larry - """Yes, but you don't need one. The stocker is just fine. """

Is there another coil rail other than the stock one?

I've talked to MSD several times about it - "Not enough market."

Last I bought one - $260 at the Dealer, $150 at Carquest. Both are made by Standard Ignition.

No need to routinely replace them.
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Old 02-04-2010, 07:22 AM   #10
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Mine had 25,000 on it when I bought it. First time I was out playing with it, it threw a misfire code. I replaced the coil rail and plugs. At 31,000 now and running good.

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