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Unread 10-25-2006, 02:37 PM   #1
93DDQZJ
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Best spark plugs for 4.0

As the title says, what is the best set of plugs to run in an older 4.0, lets say like a '93? I am thinking of going from Champions to NGKs.

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Unread 10-27-2006, 09:48 AM   #2
thejeeper02
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i use the bosch platinum 2+ pretty hot spark
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Unread 10-27-2006, 09:59 AM   #3
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I like the NGK's, but any of them will work just fine.
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Unread 10-27-2006, 10:10 AM   #4
Wheelin98TJ
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I like the Champion truck plugs - #4412.

I'd stay away from Bosch Platnum +2 plugs. Most people have problems with these. Jeep motors just don't like them.
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Unread 10-27-2006, 11:13 AM   #5
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My Bosch Platinum 2 plugs seem to work just fine. Don't forget the distributor cap and rotor. At least it's a personal preference of mine to change those too.
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Unread 10-27-2006, 11:21 AM   #6
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I put NGKs in my 5.2 last year, and love 'em. I've heard only good things about them.
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Unread 10-27-2006, 11:28 AM   #7
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I have ACCEL Plugs there great and pretty cheap some summit
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Unread 10-28-2006, 12:48 AM   #8
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Why not use the stock plugs? I believe they are Champion Copper Core. Can't go wrong, and they aren't very expensive. You will most likely not notice a difference in power, so save the $$$.
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Unread 10-28-2006, 01:55 AM   #9
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i use champions.
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Unread 10-28-2006, 02:35 AM   #10
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I've used the Autolite single platinum plugs in my Kolak Ignition Upgrade for many years now with nothing but excellent results.
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Unread 10-28-2006, 08:13 AM   #11
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Autolites and NGKs are a good plug, but I myself have Accel U-groove because they were what came with the Accel tune-up kit. I have no complaints about the Accel plugs or the tune up kit in general. I would steer away from Bosch Platinum +2 and +4s and Champion truck plugs as I have heard of people having problems with them.
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Unread 10-28-2006, 10:13 AM   #12
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I'v run NGK plugs in all my cars and love them. In my ZJ I think it had champion stock, not sure how old they were, but changing to the NGK laser plat made a fairly noticable difference in idle
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Unread 10-28-2006, 02:12 PM   #13
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Just put in some Champion Truck plugs - 90K here.
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Unread 10-28-2006, 05:27 PM   #14
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Just put Champion #4412 in both jeeps last week.
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