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Old 02-10-2011, 08:08 PM   #1
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Spark plugs

Just wondering what the best brand of spark plugs and how many I should purchase for my 2004 wrangler X 4.0.

Quadratec has e3 diamond fire spark plugs for 6.99$ each, should I order those? If so how many? Or what brand is best to help get my mileage back up from 10.5mpg.....

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Old 02-10-2011, 08:15 PM   #2
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Don't even consider the e3 plugs, those are nothing more than a gimmick spark plug whose quality isn't up to what you could get from other companies for less $$$. Not to mention the 2001 and newer 4.0L engines with the DIS (distributorless ignition system) ignition system are very fussy about the type of spark plugs it runs and I doubt your engine would be happy with the e3 for very long.

Three very good plugs you can go with that are known to work well with the newer DIS style 4.0L engines include the Autolite APP985 and Champion 7034, both of which are platinum dual-tipped plugs with platinum on both sides of the gap. Single-tipped platinum plugs with platinum on just one side of the gap like the Autolite AP985 or Champion 3034 would not work well. The third very good choice plug would be the newer iridium Autolite XP-985. Any of those three plugs will perform extremely well for 100K miles.

Non-platinum/iridium "conventional" plugs will work ok too but you'll only get 20-25K miles out of them, at the very most, when installed in a DIS type 4.0L engine.

Older non-DIS engines (those that have distributors) are not very fussy about their spark plugs at all.

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Old 02-10-2011, 08:50 PM   #3
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Thankyou very much. Do those come in a set or do I buy them individually?

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Old 02-10-2011, 08:53 PM   #4
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Your engine needs six plugs, just tell the counter guy how many you need. They come packaged in various methods including individually or sets of four, but they'll break up a set of four to give you six if needed.
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Old 02-10-2011, 08:54 PM   #5
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Would Autozone carry these? Or would I need to go somewhere else

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Old 02-10-2011, 08:57 PM   #6
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Autozone would carry at least one of the recommended three.

Autolite APP985
Autolite XP985
Champion 7034
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Old 02-10-2011, 09:00 PM   #7
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Thankyou for the help!

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Old 02-11-2011, 01:17 PM   #8
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Get the APP985s, buy 8, that way if you break one or two you've got spares.

ETA: They've also got a rebate going on those currently, you can get that on the Autolite website.
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Old 02-11-2011, 03:33 PM   #9
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I got the AutoLite XP985 at Autozone. I saw O'reily carry them at $6.99 each and offer $2.00 mail in rebate. Make sure you pick up some anti-seize and dielictric grease. Good luck.

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