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Old 02-09-2009, 12:22 AM   #1
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Spark plugs

Hey guys im gunna tear down the engine on my jeep for a project and might as well do some minor part replacements and was wondering will the bosch iridium fusion spark plugs work with a 99 jeep wrangler

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Old 02-09-2009, 12:42 AM   #2
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Quote:
Originally Posted by mechanicforme View Post
Hey guys im gunna tear down the engine on my jeep for a project and might as well do some minor part replacements and was wondering will the bosch iridium fusion spark plugs work with a 99 jeep wrangler
Don't get fancy with your plugs. Jeep was initially designated in the factory with champion copper. You cant beat OEM.

I wont use anything else.

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Old 02-09-2009, 12:55 AM   #3
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well im looking for maximum power so whatever helps im for it lol and i might be wrong but when your modding dosent aftermarket parts help a lil lol
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Old 02-09-2009, 01:16 AM   #4
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grab a set of champion copper truck plugs. great plug for the 4.0
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Old 02-09-2009, 01:25 AM   #5
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I don't think your going to find any noticeable performance with just good plugs alone. Just a waste of money in my opinion.
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Old 02-09-2009, 01:39 AM   #6
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ok cool just wondering im just trying to get the most power and life outta my jeep within reason i allready have a nos system and a cold air intake so my next step was going to be replace the plugs and wires then i was going to go for some new headers and replace all the gaskets so idk
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Old 02-09-2009, 02:04 AM   #7
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NOS?

This is a Jeep, not some riceburner...

I think you're taking this in the wrong direction....
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Old 02-09-2009, 02:11 AM   #8
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NOS!!!!!!
JUST BECAUSE IM CURIOUS HOW MUCH OF A SHOT ARE YOU RUNNING ON THAT PIG.
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Old 02-09-2009, 02:24 AM   #9
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Sorry but the whole nos thing made me think of this jeep that i came across the other day.
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Old 02-09-2009, 07:33 AM   #10
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aaaah, look at that muffler
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Old 02-09-2009, 11:33 AM   #11
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haha now that jeep is somtin else haha yea i would never take it that far lol but im running a 35 shot but yea back to what i was saying what should be my next upgrade im shooting for power and performance i tell ya though its a quick lil jeep haha
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Old 02-09-2009, 12:06 PM   #12
Knows a couple things...

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Gimmick plugs like those iridium plugs you're asking only give the gains they promise when they replace plugs that are completely worn out. At that point, any plug can produce significant gains. A less expensive but very well proven premium plug for the earlier 4.0L engine that has a distributor as yours does is the platinum-tipped AP985 by Autolite. It will easily last 90-100K miles and literally perform as well as those iridium plugs do at much less cost. If you go to the parts counter and ask for the AP985, don't let the kid at the counter up-sell you to the APP985 which is only needed if you have the newer 4.0L distributorless engine that came along in 2000. For your particular engine, you can't do better than the AP985. Whatever you do, avoid Bosch Plus2 and Plus4 plugs which don't do well for long in the 4.0L engine, as well as those snake-oil low quality Splitfires.
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Old 02-09-2009, 12:22 PM   #13
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ok awesome that was exactly the answer i was lookin for lol thx

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