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Old 05-07-2013, 07:44 AM   #91
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Quote:
Originally Posted by Jerry Bransford View Post
I don't agree that "everyone" is saying Champion's quality is going downhill.

I have a good handle on spark plug technology & what works well in a TJ. For your distributor-equipped '99 which isn't as fussy about spark plug technology like 2000 and newer distributorless 4.0L engines are, these three spark plugs will work fine: The first two, Champion 3034 or Autolite AP985 will perform well for 100k miles. Both of those are platinum-tipped. Autolite's latest iridium-tipped XP985 should perform well for 200k miles.
Sorry, not "everyone," it just seems there are quite a few people saying they are having random or spotty issues with their champion spark plugs.

Thanks for the information, though. I think I may lean toward the iridium tipped XP985s if they last longer. I know that I have a champion (enter model number here) in my lawnmower that I have had for about 7 years and haven't changed the plug yet. Makes me wonder...

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Old 05-08-2013, 09:07 AM   #92
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Would the NGK's you're talking about work in a 99 TJ 4.0 6 cyl or are they matched only for newer Jeeps?

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Old 05-08-2013, 09:58 AM   #93
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Would the NGK's you're talking about work in a 99 TJ 4.0 6 cyl or are they matched only for newer Jeeps?
You can lookup your model year on there website it will give you the model # it's easy I think they will be the same but double check.
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Old 05-08-2013, 10:03 AM   #94
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Would the NGK's you're talking about work in a 99 TJ 4.0 6 cyl or are they matched only for newer Jeeps?
Those NGKs would work fine in your '99 which isn't all that fussy about its spark plugs like 2000 and newer 4.0L engines are.

Personally, I'd run a platinum or iridium tipped plug. These two platinum tipped plugs will perform well for 100k miles, the Autolite AP985 or Champion 3034. Autolite's XP985 will perform well for what looks to be 200k miles.
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Old 05-08-2013, 11:01 AM   #95
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Thanks both of you. Is there a difference in performance/mileage using a platinum or iridium plug versus the NGK or stock Champion plug?
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Old 05-08-2013, 11:21 AM   #96
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Thanks both of you. Is there a difference in performance/mileage using a platinum or iridium plug versus the NGK or stock Champion plug?
That's what everyone is arguing about.
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Old 05-08-2013, 11:28 AM   #97
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Thanks both of you. Is there a difference in performance/mileage using a platinum or iridium plug versus the NGK or stock Champion plug?
Not usually until the you get to the 3X-4X longer life of the platinum or iridium plugs when compared to the shorter life of a conventional plug. And a conventional plug will only last half as long in a 2000 or newer DIS (distributorless ignition system) 4.0L engine when compared to a '99 or older with a conventional distributor. Spark plugs in a DIS 4.0L engine are fired twice as often so they only last half as many miles before they wear out. That is why I push for platinum or iridium plugs so hard in newer engines.

But in some difficult conditions, you can indeed get better performance/mpg from the fine-wire technology like some platinum plugs & pretty much all iridium tipped plugs have. Fine wire plugs require less voltage to fire them & they can fire more reliably in difficult conditions like if they are fouled from an engine problem.
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Old 05-08-2013, 12:15 PM   #98
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Thanks for the info, Jerry! I was looking for something like that for information on plugs!
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Old 05-08-2013, 01:05 PM   #99
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Now admittedly this is at the upper end of the performance spectrum. But I can say that just because two plugs have the same heat range rating does not mean they are equal. Just in the ground strap alone there is power to be made. Where did the MFG weld the ground strap on at. Does it orient itself when torqued to a place that blocks the center electrode from the incoming charge. Does the strap cover the tip of the plug or does it expose the spark kernel to the incoming charge. Little things can make a difference when your talking a system that has a lot of limits on it. I have dyno'ed engines and seen power from plug mods. If the power goes up and the BFSC goes down then your going to use less fuel to make the same or better power.
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Old 05-08-2013, 02:16 PM   #100
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Thanks both of you. Is there a difference in performance/mileage using a platinum or iridium plug versus the NGK or stock Champion plug?
I think the issue I had was not that the stock plugs gave better performance but that after changing out the plugs with 100K+ on them with champin plugs I noticed a decreace in performance and MPG. and after running those for 2k I got fustrated and put in the stock plugs and noticed a great increase in power and MPG back to what it should have been stock. thats why I was suprised by the plug change.
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Old 05-08-2013, 02:33 PM   #101
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OK...I'm conservative. I went with the NGK plugs, replaced wires, rotor, distributor cap and it seems to run smoother. But the proof will be when I take it out warmed up on the road at higher speed than around the block. It was getting 20 mpg (60 mph and below) and 18 mpg (around town) before I did all this. I bought it with 72,000 miles on it and I'm pretty sure the wires and plugs were original. The firing pins (if that's the right terminology) on the plugs were worn way down, the rotor and terminals on the distributor cap were pitted really bad, and the plug gap was way larger than .035. So I'm glad I changed out everything. Now we'll see if I may have a jump in power. The mpg can stay the same!!!
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Old 05-08-2013, 03:17 PM   #102
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so the stock o2 sensors are NGK... maybe pairing them with NGTKs or whatever will help im gonna try...just replace my 02s bout a month ago
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Old 06-08-2013, 11:11 AM   #103
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OK...I'm conservative. I went with the NGK plugs, replaced wires, rotor, distributor cap and it seems to run smoother. But the proof will be when I take it out warmed up on the road at higher speed than around the block. It was getting 20 mpg (60 mph and below) and 18 mpg (around town) before I did all this. I bought it with 72,000 miles on it and I'm pretty sure the wires and plugs were original. The firing pins (if that's the right terminology) on the plugs were worn way down, the rotor and terminals on the distributor cap were pitted really bad, and the plug gap was way larger than .035. So I'm glad I changed out everything. Now we'll see if I may have a jump in power. The mpg can stay the same!!!
Any update?
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Old 07-04-2013, 08:24 PM   #104
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In my 2004 4.0, I installed a set of Autolite double platinums today. Smoother response and idle noticed immediately. Will monitor mpg. I have consistently averaged 18.7 mpg up to now.
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Old 07-05-2013, 06:59 AM   #105
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Changed plugs 30 days ago in my 99 sport. Put in platinum Champions. Was very careful on gapping. At first ran like a new rig. Now am losing power. Can't say mileage ever got better but had noticeable power increase. Now thinking I should change out to NGK
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Old 07-05-2013, 10:31 AM   #106
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Changed plugs 30 days ago in my 99 sport. Put in platinum Champions. Was very careful on gapping. At first ran like a new rig. Now am losing power. Can't say mileage ever got better but had noticeable power increase. Now thinking I should change out to NGK
I'd guess something else is causing the problem. Your '99 with its old-school distributor isn't all that fussy about its spark plug technology so long as the plug is the right model for the 4.0L engine.
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Old 07-05-2013, 12:17 PM   #107
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I'd guess something else is causing the problem. Your '99 with its old-school distributor isn't all that fussy about its spark plug technology so long as the plug is the right model for the 4.0L engine.
I agree with Jerry. I'd be looking elsewhere for the issue. Plugs are probably not your issue.
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Old 07-05-2013, 04:18 PM   #108
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Replaced cap, rotor, plugs and wires. Checked wires today and all seems good. There was noticeably more power when I first changed plugs. Especially on the high end, going up hill in 5th. Now is back to where I was before I changed plugs. Took 4 of the plugs out today, they looked good. Don't know what happened, but have lost power. With other complaints thought I might try the NGK;s.
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Old 07-05-2013, 04:57 PM   #109
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What model Champions did you install, were they a 3034 or 7034?
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Old 07-05-2013, 05:03 PM   #110
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3034
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Old 07-05-2013, 05:04 PM   #111
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Pretty sure on that. They were the platiniums.

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