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Old 03-01-2011, 08:33 AM   #1
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Replacing spark plugs (05 tj with coil pack)

Since i've never had this setup before, How do I change them with the new system? (I did a search and didn't see anything about this.)

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Old 03-01-2011, 08:42 AM   #2
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I have an '00 TJ. I had to remove 2 bolts from the passengers side on the plug rail. Use equal force to remove the rail. Also when you replace the plugs use an anti-sieze product on the threads and the plug at the boot.
Hope this helps.

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Old 03-01-2011, 08:43 AM   #3
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The coil pack is held in place with several bolts, remove them. Then the coil pack is pulled off as one long assembly, pulling evenly across its length. Only the spark plug boots really hold it on once the bolts are removed. Once it is off, the plugs are replaced as normal.

Be wary about what spark plugs you install as the coil pack engine is very fussy about what plugs it gets. Three very good choices that will work well include the Champion 7034, Autolite APP-985 (both of those are double-tipped platinums), or Autolite XP-985 which is an iridium tipped plug. Make sure not to install any single-tipped platinum plugs like the Champion 3034 or Autolite AP-985 as they will cause problems.
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Old 03-01-2011, 08:48 AM   #4
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Originally Posted by htfiremedic View Post
I have an '00 TJ. I had to remove 2 bolts from the passengers side on the plug rail. Use equal force to remove the rail. Also when you replace the plugs use an anti-sieze product on the threads and the plug at the boot.
Hope this helps.
Antiseize contains metallic and or carbon particulates. So while a dab of antiseize on the spark plug threads is a good suggestion, I would not use that inside the spark plug boots. Instead, use dielectric grease inside the boots instead to prevent the boot from seizing to the spark plug.
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Old 03-01-2011, 09:08 AM   #5
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Actually, these are the kind of sparkplugs i ordered: NGK Spark Plugs 3459 - NGK V-Power Spark Plugs - Overview - SummitRacing.com

I only ordered from there since I had to order something else.
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Old 03-01-2011, 09:15 AM   #6
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That plug will work fine but you'll only get half the life out of it in the coil rail type 4.0L engine that you would with that plug with a conventional engine. That is because the DIS (distributorless ignition system) engine you have fires the spark plugs twice as often as happens with the older style ignition. That's why I recommended the specific plugs I did above, any of those three will run well for at least 100K miles.
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Old 03-01-2011, 11:19 AM   #7
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use dielectric grease inside the boots instead to prevent the boot from seizing to the spark plug.

This will make your life a better place to be 30K miles from now.
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Old 03-01-2011, 11:21 AM   #8
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This will make your life a better place to be 30K miles from now.
And 100K miles if the right dual-tipped platinum spark plugs are used.
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Old 03-01-2011, 11:27 AM   #9
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I always use the Champion cheapos. I keep all the fancy parts on the outside of the engine!
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Old 03-01-2011, 11:41 AM   #10
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How long are factory plugs good for?
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Old 03-01-2011, 11:44 AM   #11
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How long are factory plugs good for?

Should change them out at 30K
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Old 03-01-2011, 12:02 PM   #12
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X2 as Jerry said .
I just did my 04 and it had been years ago the last time I did plugs ON ANYTHING .
Coil Packs (Rail) has 4 - 1/2 inch bolts No need to remove the rail from the wiring just let it hang down .
I use the Autolites APP-985 $27 bucks and 11 bucks for the dielectric grease inside the boots . I bought the grease at ACE hardware and plugs at NAPA
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Old 03-02-2011, 07:11 AM   #13
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Ok well when i get my plugs in I'll be sure to ask anything else that may arise... jerry can i get you on speed dial?
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Old 03-02-2011, 07:18 AM   #14
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personal preference-especially if you don't plan on taking off rail for another 100k-there is a small contact spring inside each boot. I replace those as well-I think it was less than 20 bucks for all 6.
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Old 03-02-2011, 07:21 AM   #15
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Are they a dealership part? and im guessing you just pull them out with a pair of pliers (most likely needlenose?)
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Old 03-03-2011, 06:04 AM   #16
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No not dealership part-got mine at O'Rieley? and yeah needle nose would work but if I remember correctly they came out very easy twisting the end of the spring
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Old 03-15-2011, 12:38 AM   #17
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Anyone ever use the E3 plugs, read many reviews abt them in other vehicles, but would love to hear some opinions of how our 4.0s like them. Thanks!!

Tyler
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Old 03-15-2011, 12:45 AM   #18
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E3 plugs are just another gimmick spark plug along the lines of the Splitfire and they don't help in the least unless the plugs they replaced were completely worn out. And even then you're better off with an Autolite, Champion, NGK, etc..

Plus if you have 2000 or newer TJ, your engine is a DIS (distributorless ignition system) which is very (!) picky about the type of spark plugs it gets and E3 plugs are not a good choice for them. What model year TJ do you have?
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Old 03-15-2011, 08:01 AM   #19
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Anyone ever use the E3 plugs, read many reviews abt them in other vehicles, but would love to hear some opinions of how our 4.0s like them. Thanks!!

Tyler
I had the E3 plugs and thought they were garbage. If you try to accelerate out of low RPM range the engine would try to stall. I gave them up for some Champions and my Jeep runs well again. The way I look at it is if you don't have a performance engine, you don't need performance plugs. I have heard great things about E3 plugs at the race track but nothing good for offroad vehicles.
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Old 03-15-2011, 08:03 AM   #20
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Anyone ever use the E3 plugs, read many reviews abt them in other vehicles, but would love to hear some opinions of how our 4.0s like them. Thanks!!

Tyler
I bought the E3 plugs for my 06 4.0L TJ and they were horrible. After about a week of having them installed, my Jeep would die when I would take off. It wouldnt do it every time, lets say about once every 8 times I cam to a complete stop. As soon as I would take of the Jeep would fall on its nose but would start right up. I changed out the E3 plugs and never had the problem again.
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Old 03-15-2011, 02:17 PM   #21
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I have an 05 TJ, but after reading these reviews that more than enough info not to buy them, Thanks for everyones input!!
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Old 03-15-2011, 06:12 PM   #22
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They are "high performance plugs." They are a very high performance - high profit for them
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Old 03-15-2011, 06:47 PM   #23
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Id like to butt-in if I may... My LJ has Bosch platinum IR fusion 4508s (sounds more like a mens razor ad ) they were in it when I bought it. Any thoughts on them? It runs fine, mileage is horrible, around 12-13, but that's not breaking news to anyone. Thanks
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Old 05-11-2013, 11:52 PM   #24
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Jerry, after reading your post on the spark plugs I have a question. I own an 05 Wrangler TJ, bought it used and an replacing the plugs. What came out are NGK ZFR5N with a monstrous gap of .080, is that correct or were they that worn? Those plugs were not available at the time so I got Champ RC12L YC and the recommended gap is about .040 does this sound right??
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Old 05-12-2013, 12:07 AM   #25
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I'm not Jerry, but yes, .080" is far too wide. They can wear that much, yes. Gap the new ones to .035"-.040"
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Old 05-12-2013, 09:23 AM   #26
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Should change them out at 30K
gosh I wish I had known that. I went to 102K before changing. 05 unlimited 4.0. Maybe I better change my oil.

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