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Topic Review (Newest First)
07-05-2013 06:04 PM
ljjp10 Pretty sure on that. They were the platiniums.
07-05-2013 06:03 PM
ljjp10 3034
07-05-2013 05:57 PM
Jerry Bransford What model Champions did you install, were they a 3034 or 7034?
07-05-2013 05:18 PM
ljjp10 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.
07-05-2013 01:17 PM
Chuck59
Quote:
Originally Posted by Jerry Bransford View Post
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.
07-05-2013 11:31 AM
Jerry Bransford
Quote:
Originally Posted by ljjp10 View Post
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.
07-05-2013 07:59 AM
ljjp10 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
07-04-2013 09:24 PM
Chuck59 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.
06-08-2013 12:11 PM
RioGrande95YJ
Quote:
Originally Posted by fj40jeepster View Post
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?
05-08-2013 04:17 PM
spenserb 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
05-08-2013 03:33 PM
fj40jeepster 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!!!
05-08-2013 03:16 PM
dcarey
Quote:
Originally Posted by fj40jeepster View Post
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.
05-08-2013 02:05 PM
Gunner 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.
05-08-2013 01:15 PM
Bielzebub Thanks for the info, Jerry! I was looking for something like that for information on plugs!
05-08-2013 12:28 PM
Jerry Bransford
Quote:
Originally Posted by fj40jeepster View Post
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.
05-08-2013 12:21 PM
OhSixTJ
Quote:
Originally Posted by fj40jeepster View Post
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.
05-08-2013 12:01 PM
fj40jeepster Thanks both of you. Is there a difference in performance/mileage using a platinum or iridium plug versus the NGK or stock Champion plug?
05-08-2013 11:03 AM
Jerry Bransford
Quote:
Originally Posted by fj40jeepster View Post
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.
05-08-2013 10:58 AM
dcarey
Quote:
Originally Posted by fj40jeepster View Post
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.
05-08-2013 10:07 AM
fj40jeepster 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?
05-07-2013 08:44 AM
Bielzebub
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...
05-06-2013 05:55 PM
UFOtestpilot I have a '99. I bought champion 3034 plugs, made in USA right on the box, 4k (ish) miles, zero issues. I've done maybe 20 miles on the freeway on my jeep so I don't have mileage for that, mpg on surface streets in traffic with a heavyish right foot: 12.5 consistently over time.
05-06-2013 03:45 PM
Jerry Bransford
Quote:
Originally Posted by Bielzebub View Post
Awesome... with all the wonderful things that everyone has been saying about champion going downhill in qc, I will look at something else. Does anyone have time to educate and idiot on spark plug types and how they differ? I know what they do, but that's about it.
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.
05-06-2013 03:33 PM
Bielzebub
Quote:
Originally Posted by dcarey View Post
THe NGK sparkplugs i quoted in the first post are stock ones for 00 to 06 4.0L engines or 01 to 06 can't remember off the top of my head. Look at the white emmissions sticker under your hood for the type your engine takes for stock. I think they will be champin's are stock for your model.
Awesome... with all the wonderful things that everyone has been saying about champion going downhill in qc, I will look at something else. Does anyone have time to educate and idiot on spark plug types and how they differ? I know what they do, but that's about it.
05-06-2013 03:32 PM
dcarey
Quote:
Originally Posted by Bielzebub View Post
Does this actually accomplish anything?
What do you have to loose give it a try. its free and could help.
05-06-2013 03:26 PM
dcarey
Quote:
Originally Posted by Bielzebub View Post
Interestingly enough after reading this thread I thought I would look into the NGK's and advanced auto parts is telling me that it won't fit my 2.5L 99 TJ. Is this right or am I just doing something wrong? Or is their website incorrect?
THe NGK sparkplugs i quoted in the first post are stock ones for 00 to 06 4.0L engines or 01 to 06 can't remember off the top of my head. Look at the white emmissions sticker under your hood for the type your engine takes for stock. I think they will be champin's are stock for your model. They should be able to find the NGK version for your 2.5L they are the V power model.
05-06-2013 11:56 AM
Jerry Bransford
Quote:
Originally Posted by Bielzebub View Post
Does this actually accomplish anything?
Sometimes it can be useful but not normally. I have never needed to do it to fix anything for either of my two TJs over the past 17 years.
05-06-2013 11:54 AM
Bielzebub Does this actually accomplish anything?
05-06-2013 11:06 AM
Jerry Bransford You don't need to flash the computer to erase the adaptive memory. You can either touch the battery connectors together with the head lights on to completely drain the capacitors that store a charge which keep the adaptive memory alive for a period of time, or just leave the battery disconnected for an extended period of time.
05-06-2013 11:03 AM
AB824
Quote:
Originally Posted by Bielzebub View Post

Stupid question here, what's "adaptive memory?" IDK what that is or how to reset it...
It is flashing the computer. Basically erasing the memory. Then it will run off a factory set of parameters while it relearns your driving habits.
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