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Unread 02-14-2009, 12:29 PM   #1
onlyn8v
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4.0 Spark plugs

Im going to change my plugs for the first time (25k miles) and I remember there was a post that said do not use ____ plugs in the 03-06 engines. Can you guys give me some more info and recommend the brands you guys use?

I searched- but my search is somewhat limited

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Unread 02-14-2009, 01:22 PM   #2
inutero1212
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i have used the E3's my dad got me for x-mas and no issues thus far. Sock ole brand worked okay as well other than having to regap every single one of them.
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Unread 02-14-2009, 01:55 PM   #3
Jerry Bransford
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You want to avoid any single-tipped platinum plugs on newer engines that don't have a distributor which is the kind of engine you have. A very good choice for newer 4.0L distributorless engines like yours is the double-tipped Autolite APP985 which will last 90-100K miles. Make sure to avoid the AP985 which is only suitable for older 4.0L engines that have a distributor.
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Unread 02-14-2009, 01:58 PM   #4
Pillswoj
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Do not use single platinum plugs, it will cause misfires on the coil pack equipped TJ's. I would suggest the Autolite APP985 plugs which are double platinum, they will last forever. Otherwise just go conventional copper and replace every 30000.
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Unread 02-15-2009, 06:05 AM   #5
onlyn8v
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Im going to grab the APP985's thanks!
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Unread 02-15-2009, 01:30 PM   #6
silvanus
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I have them in my L J,and the ol' 4.0 is running tight. Go for it!
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Unread 02-15-2009, 01:34 PM   #7
M2LJ
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Go to Amazon.com for them, I got a great deal from them on the Autolite APP985 plugs!

Cheers! M2
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