Best spark plugs for 4.0 -

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post #1 of 14 Old 10-25-2006, 02:37 PM Thread Starter
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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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post #2 of 14 Old 10-27-2006, 09:48 AM
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i use the bosch platinum 2+ pretty hot spark

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post #3 of 14 Old 10-27-2006, 09:59 AM
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I like the NGK's, but any of them will work just fine.
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post #4 of 14 Old 10-27-2006, 10:10 AM
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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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post #5 of 14 Old 10-27-2006, 11:13 AM
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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.

'97 ZJ, 4wd, 4.0, 3" Pro Comp lift, 31" BFG MT KM2s, JKS Front & Rear trackbars, JKS Disco's, Rear Aussie
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post #6 of 14 Old 10-27-2006, 11:21 AM
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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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post #7 of 14 Old 10-27-2006, 11:28 AM
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I have ACCEL Plugs there great and pretty cheap some summit

97 Grand Cherokee, 71,000 Miles, 3inch Skyjacker, 2in Bds Budget Boost,2006 Runicon Wheels with Mtr's,Magnaflow exhaust with high flow converter, Limited panels on a larado, K&n fipk system , and hypertech programer
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post #8 of 14 Old 10-28-2006, 12:48 AM
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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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post #9 of 14 Old 10-28-2006, 01:55 AM
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i use champions.

-95' grand cherokee w/ 5.2. ARB & xd9000. IRO 4.5" w/ 33's. 8.8 & HP 30 w/ 4.10's both aussie locked and some other goodies.
-97' grand cherokee w/ 4.0. stock.
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post #10 of 14 Old 10-28-2006, 02:35 AM
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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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post #11 of 14 Old 10-28-2006, 08:13 AM
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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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post #12 of 14 Old 10-28-2006, 10:13 AM
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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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post #13 of 14 Old 10-28-2006, 02:12 PM
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Just put in some Champion Truck plugs - 90K here.

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post #14 of 14 Old 10-28-2006, 05:27 PM
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Just put Champion #4412 in both jeeps last week.

04TJ 4.0 rc 4" susp lift, jks 1.25" bl, 1" front spacers, brown dog mml, aa sye, tw ds, 35" mtrs, rock crawler front bumper, barnes 4x4 rear bumper and tire carrier, ar wheels, 8.8 with lockright, jeeperman sliders, warn m8000, jks quicker discos

95ZJ 4.0 rusty's 3" susp lift, 2" front spacers, 33" mtrs, addcos front and rear, black diamond front track bar, jks rear track bar, jks quicker discos, trimmed fenders

It just goes to show you can't always tell the depth of the well by the length of the handle on the pump.
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