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Old 05-03-2009, 09:12 PM   #1
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Which spark plug is the best for Wrangler 4.0

How about NGK V power vs the autolite platinum tip!
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Old 05-03-2009, 09:15 PM   #2
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only use the o.e. plugs. plain ole champion, untill the ngk switch with the direct ignition.

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Old 05-03-2009, 09:15 PM   #3
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I would just use regular plain old plugs, auto lite, champion.
None of that platinum, +4 crap.
Wont do nothing for your jeep.
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Old 05-03-2009, 09:39 PM   #4
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Champion 4412 Truck Plug
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Old 05-03-2009, 09:58 PM   #5
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Check the underhood label, or the owner's manual, or the service manual - even the dealer.
Parts houses will lie - they want to sell you their high profit junk - that probably won't work right.

Use the plugs the engine was designed to use!
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Old 05-03-2009, 10:24 PM   #6
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I just put in Dealer plugs and my jeep is running better .
The box said Moper but on the plugs was NGK.
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Old 05-03-2009, 10:58 PM   #7
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What they said
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Old 05-04-2009, 01:30 AM   #8
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I use the quadruple tip titanium noise suppresed wrapped in palladiium, with a tungstin carbide shaft, sure they are $94 each but why would my parts guy steer me wrong

Use plain old champion, anything else won't do anymore except lighten your wallet. And in some cases people on here have said it made their Jeep run worse.
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Old 05-04-2009, 07:27 AM   #9
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try butt-plugs
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Old 05-04-2009, 11:07 AM   #10
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What model year do you have? If it's a 2000 or newer with a distributorless ignition, I personally would go with a Champion 7034 or Autolite APP985 which are both double-tipped platinum plugs. They perform at the same level as a conventional plug like the Champion 4412 Truck plug but they will outlast it by around 3X. The APP985 is probably the most recommended plug for the 2000 and later 4.0L engines and gets 100% rave reviews from those that actually run it

However, you need to be cautious and not install any single-tipped platinum plugs like the Autolite AP985 in your distributorless engine. Any single-tipped platinum plug will cause problems not long after installation in your particular engine. Jeep even has a TSB out to pull single-tipped platinum plugs if they see them. The reason being that your engine has three ignition coils shared between six spark plugs when a coil fires, it gives spark to two plugs simulataneously but only one plug is on its compression stroke. For some reason, plugs that don't have identical materials on both sides of the gap (single-tipped platinum has platinum on just the tip instead of dual-tipped which has platinum on both sides of the gap) create problems for that type of engine.

You can't do better than the Autolite APP985 or Champion 7034, either of which will give you pretty close to 100K miles of life without problem. I used to run the Champion 4412 Truck plug but it didn't perform any better than the Autolites I now run and they only lasted one third as long as the Autolites do.
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Old 05-04-2009, 12:14 PM   #11
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Jerry...are the app985s' already pre-gapped, or do you have to do it upon change? And if so, what's the gap? Thanks
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Old 05-04-2009, 12:19 PM   #12
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I haven't seen a plug in recent years that wasn't pre-gapped to work with the applications individual plugs were designed for. The Autolite AP985 & APP985, Champion 7034, and Champion 4412 Truck plug all come pre-gapped to the .035 gap that our Jeep engines use. It wouldn't be a bad idea to double-check the gap though.
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Old 05-04-2009, 12:53 PM   #13
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Spark plugs can have multiple applications with different gaps. Always gap them. Not to mention even if it were true, they get bounced around in shipping.
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Old 05-04-2009, 01:00 PM   #14
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Good info...thanks to the both of you
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Old 05-05-2009, 04:56 PM   #15
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when you install your spark plugs remember to top ur plugs off with spark plug fluid
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Old 05-05-2009, 05:17 PM   #16
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The Autolite APP985's have a $1.25 rebate per plug right now.
http://www.autolite.com/rebate/pdf/spark-plug-09.pdf
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Old 05-05-2009, 05:29 PM   #17
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oem
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Old 05-05-2009, 06:00 PM   #18
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In anything but a full-race engine, I always go with what the manufacturer recommends. As for pre-gapped bits, always check anyways. They often ARE in-spec, but you never know when some bonehead might have dropped a package, or if they just weren't gapped right from the factory- Mark W.
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Old 05-05-2009, 08:39 PM   #19
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thanks good point!

Quote:
Originally Posted by thaduke2003 View Post
In anything but a full-race engine, I always go with what the manufacturer recommends. As for pre-gapped bits, always check anyways. They often ARE in-spec, but you never know when some bonehead might have dropped a package, or if they just weren't gapped right from the factory- Mark W.
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Old 05-06-2009, 09:23 PM   #20
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Everyone says that the plugs come pregapped now days, but when i changed my plugs a couple months back i checked each one and they weren't even close to the .035 gap that the jeep calls for, so i gapped all my plugs at .035 and put them in. The plugs i put in are Champion 7034 double platinum.
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Old 10-25-2010, 04:38 PM   #21
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Quote:
Originally Posted by Jerry Bransford View Post
What model year do you have? If it's a 2000 or newer with a distributorless ignition, I personally would go with a Champion 7034 or Autolite APP985 which are both double-tipped platinum plugs. They perform at the same level as a conventional plug like the Champion 4412 Truck plug but they will outlast it by around 3X. The APP985 is probably the most recommended plug for the 2000 and later 4.0L engines and gets 100% rave reviews from those that actually run it

However, you need to be cautious and not install any single-tipped platinum plugs like the Autolite AP985 in your distributorless engine. Any single-tipped platinum plug will cause problems not long after installation in your particular engine. Jeep even has a TSB out to pull single-tipped platinum plugs if they see them. The reason being that your engine has three ignition coils shared between six spark plugs when a coil fires, it gives spark to two plugs simulataneously but only one plug is on its compression stroke. For some reason, plugs that don't have identical materials on both sides of the gap (single-tipped platinum has platinum on just the tip instead of dual-tipped which has platinum on both sides of the gap) create problems for that type of engine.

You can't do better than the Autolite APP985 or Champion 7034, either of which will give you pretty close to 100K miles of life without problem. I used to run the Champion 4412 Truck plug but it didn't perform any better than the Autolites I now run and they only lasted one third as long as the Autolites do.
Does this information also apply to 2000 and OLDER? I have a 1999 Wrangler with the 4.0L. Would you still recommend the Autolite APP985 or Champion 7034?
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Old 10-25-2010, 04:45 PM   #22
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Does this information also apply to 2000 and OLDER? I have a 1999 Wrangler with the 4.0L. Would you still recommend the Autolite APP985 or Champion 7034?
No, that does not apply to 1999 and older 4.0L engines that have distributors. The two lower cost yet still platinum-tipped (single-tipped) plugs that are more appropriate for your distributor equipped 4.0L engine are the Autolite AP985 (not APP985) or the Champion 3034. You'll get right at 100K miles of good performance with either of those plugs.

Technically you COULD run also run the more expensive Autolite APP985 and Champion 7034 and they would run just as well but there would be zero benefit to doing so, nor would they last any longer.
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Old 10-25-2010, 04:54 PM   #23
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Originally Posted by Jerry Bransford View Post
No, that does not apply to 1999 and older 4.0L engines that have distributors. The two lower cost yet still platinum-tipped (single-tipped) plugs that are more appropriate for your distributor equipped 4.0L engine are the Autolite AP985 (not APP985) or the Champion 3034. You'll get right at 100K miles of good performance with either of those plugs.

Technically you COULD run also run the more expensive Autolite APP985 and Champion 7034 and they would run just as well but there would be zero benefit to doing so, nor would they last any longer.
Great! Thanks for your help!
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Old 10-25-2010, 06:01 PM   #24
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My 2003 4.0L calls for RC12ECC or ZFR5N, both gapped at 0.035". The former is made by Champion and the latter by NGK.

I have used both and they work equally well.

Torque for those plugs is 27 ft.lbs. There's no need for anti-seize as the plugs are already treated by the manufacturer. Use dielectric grease on the terminals and boots.
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Old 10-25-2010, 06:26 PM   #25
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My 2003 4.0L calls for RC12ECC or ZFR5N, both gapped at 0.035". The former is made by Champion and the latter by NGK.

I have used both and they work equally well.
Yes the factory spec shows those two plugs but in the newer DIS (distributorless ignition system) equipped TJs like you have, conventional plugs like those will now last only half as long as they did with the older distributor-equipped engines.

Instead of the 25K or so miles we could expect from that type plug, we can now only expect perhaps 12-13K miles because DIS ignition systems fire each plug twice as often as the older ignition systems did. The factory installs that plug because it saves them around $8 per vehicle.
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Old 10-25-2010, 06:36 PM   #26
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I just put in the champion 7034 on Sat. (Thanks Jerry) and man she runs like a champ! I could not track down the autolites so i went with 7034's.
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Old 10-25-2010, 07:35 PM   #27
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Autolite - the same company that makes FRAM!
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Old 10-25-2010, 07:38 PM   #28
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I came in here to say what Jerry said, but he beat me to it, and explained things well. I put in a set of six Champion 7034's last week and she runs great. '02 Sahara. They were pre-gapped to .035 but I checked them all anyways.

Had to go with those since Champion is my last name =P
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Old 10-25-2010, 07:44 PM   #29
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Autolite - the same company that makes FRAM!
No, it's not. That would be like saying Miller makes Hobart welders. Autolite doesn't make or own Fram and Miller does't make or own Hobart. They are owned by the same respective holding companies but that is where the similarities end. Honeywell owns Autolite, Fram, and Prestone, and as such, Autolite does not own Fram or make any of Fram's products. They are separate companies.
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Old 10-25-2010, 07:56 PM   #30
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Never trust the factory setting. Always gap 'em yourself. Some dont believe in the clear superiority of synthetic oils *ahem Jerry* I dont believe in platinum bs. Use only champion copper.

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