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Old 09-04-2012, 08:54 PM   #91
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Now I am completely confused.. I have an '05 LJ with a 4.0L .. I just bought and installed some Champion 7034 double platinums.. are the 3034s better? I will say this, breaking them lose wasnt all that bad nor all that fun either, they had a nice "crack" to them when they broke lose. I am guessing they were original to the Jeep, I didnt look to see what they were, but they werent in horrible shape either. She does seem to be running nicely now though.
Anyway, please advise as to whether I got the right plugs.. I really dont want to have to change them again that soon.

Dana

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Old 09-04-2012, 09:18 PM   #92
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Quote:
Originally Posted by DBoat
Now I am completely confused.. I have an '05 LJ with a 4.0L .. I just bought and installed some Champion 7034 double platinums.. are the 3034s better? I will say this, breaking them lose wasnt all that bad nor all that fun either, they had a nice "crack" to them when they broke lose. I am guessing they were original to the Jeep, I didnt look to see what they were, but they werent in horrible shape either. She does seem to be running nicely now though.
Anyway, please advise as to whether I got the right plugs.. I really dont want to have to change them again that soon.

Dana
You're good with the 7034's, evidently the older 4.0's (no coil rail) take the 3034's. I've been running the 7034's for a long time in my 01 and like them.

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Old 09-04-2012, 09:21 PM   #93
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You're good with the 7034's, evidently the older 4.0's (no coil rail) take the 3034's. I've been running the 7034's for a long time in my 01 and like them.
Thanks, think I can get 50K miles out of them?
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Old 09-04-2012, 09:28 PM   #94
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Quote:
Originally Posted by DBoat

Thanks, think I can get 50K miles out of them?
As long as you don't have something else going on that would foul them, sure, probably 100,000. I change mine every couple years just to look around/tune up. Never had a problem with the gap on them either.
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Old 09-05-2012, 09:16 AM   #95
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As long as you don't have something else going on that would foul them, sure, probably 100,000.
Yep 100K miles of good performance for the Champion 7034 or Autolite APP985 can be expected.
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Old 09-05-2012, 09:58 AM   #96
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Have a '97 2.5, auto, a/c and my MPG seems to have dropped from about 15 to about 12 lately? I think this may just be due to running my A/C non-stop all the time because it has been super hot this summer?

Replaced bad distibutor with a aftermarket new one, cap, rotor, Mopar wires 5K ago. I also wonder if it might be my plugs? I installed NGK copper plugs about 5K miles ago. I wonder if my plugs are part of my problem? Should I go back to the OEM Champion plugs or something else?

What is a solid performing plug for the 2.5L?
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Old 09-05-2012, 10:29 AM   #97
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Those copper NGK copper plugs are fine, especially with only 5k miles on them. Good platinum plugs include the Autolite AP986 and Champion 3034.
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Old 09-05-2012, 09:00 PM   #98
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The guy at the auto store gave me NGK 2477 iridium ix for my 2005 wrangler sport i6 auto, are these ok? Thank you for any feedback!
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Old 09-07-2012, 03:14 PM   #99
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Returned them for the autolite xp985's
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Old 09-07-2012, 03:19 PM   #100
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Originally Posted by Mudsearcher77
The guy at the auto store gave me NGK 2477 iridium ix for my 2005 wrangler sport i6 auto, are these ok? Thank you for any feedback!
My 06 came factory with ngk
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Old 09-07-2012, 03:21 PM   #101
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Also, this is the typical breakdown
Auto lite- ford
Ngk-honda Nissan etc
Delco- GM
Champion- Chrysler (jeep)
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Old 09-08-2012, 05:28 AM   #102
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The guy at the auto store gave me NGK 2477 iridium ix for my 2005 wrangler sport i6 auto, are these ok? Thank you for any feedback!
I have had a couple tell me that they are good plugs, but I have always used Bosch with very good results.

Advanced Auto tried to sell me E3s, but I declined.
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Old 09-08-2012, 11:12 AM   #103
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Just installed the new autolites, stock ngk's were gapped out to .80 after 101k miles...first time ever changing plugs, took about 30 mins

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Old 09-08-2012, 11:37 AM   #104
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Quote:
Originally Posted by Mudsearcher77
Just installed the new autolites, stock ngk's were gapped out to .80 after 101k miles...first time ever changing plugs, took about 30 mins
Those look like what I took outta mine.. And anyone who says that plugs come per-gapped are smoking something. The closest any of the plugs I got were .050. That would have made for a great running Jeep. Oh, I was all worried about getting to that last plug, and taking off the coils. But didn't have to unplug the connection and it went pretty smoothly. So I would say at least give it a try.
Dana
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Old 09-08-2012, 11:58 AM   #105
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Quote:
Originally Posted by DBoat

Those look like what I took outta mine.. And anyone who says that plugs come per-gapped are smoking something. The closest any of the plugs I got were .050. That would have made for a great running Jeep. Oh, I was all worried about getting to that last plug, and taking off the coils. But didn't have to unplug the connection and it went pretty smoothly. So I would say at least give it a try.
Dana
mine came pre-gap'd around 30-35, I also cut the tie strap holding the coil rack to the wiring in the back, made it easier to move
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Old 09-09-2012, 05:45 AM   #106
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Originally Posted by Mudsearcher77

mine came pre-gap'd around 30-35, I also cut the tie strap holding the coil rack to the wiring in the back, made it easier to move
I didn't know about that mod. How does one do that? Any post cut issues?
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Old 09-09-2012, 08:14 AM   #107
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Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
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Old 09-09-2012, 09:07 AM   #108
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Quote:
Originally Posted by DBoat

I didn't know about that mod. How does one do that? Any post cut issues?
No issues, there is a tie strap holding the coil rack to some wires towards the back, if you cut the strap you can move the coil rack around alot easier
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Old 09-09-2012, 09:22 AM   #109
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Quote:
Originally Posted by epossum
Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
F that. Just go to any parts store and get Champion 3034 plugs.

99 and older 3034, 2000 and newer 7034. (as posted earlier in this thread and many others.) I run the 7034's in my 01 and couldn't be happier.
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Old 09-09-2012, 10:52 AM   #110
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Gees, I just checked Mopar for OEM spark plugs for my '97 4L. $2.30 each which is OK but $14.95 to ship them UPS which is their cheapest option. They must be solid gold and weigh about 50 pounds. The total is $28.75 before tax or any other charges they care to add on. I guess a trip to the dealer would be cheaper, at least before gas gets any more expensive.
The economy is slow and dealers want business selling cars and parts. $2.00-$2.30 for the Mopar plugs is a good price. Ask local Mopar dealer for a "jobber discount" for the plugs to save on the crazy shipping cost. Or go to any parts store for Champions.
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Old 09-09-2012, 11:03 AM   #111
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Originally Posted by Mudsearcher77 View Post
Just installed the new autolites, stock ngk's were gapped out to .80 after 101k miles...first time ever changing plugs, took about 30 mins

Attachment 158217

I just did mine too. Status of the ones that I pulled out was basically unknown, but didn't look bad. Aside from the gaps being all over the place. Some as much as .060, some as small as .025. I don't think the PO gapped them at all, just stuck them in. Oddly enough, he used dielectric grease on them, probably because the seller either gave it to him or recommended it.
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Old 09-09-2012, 07:56 PM   #112
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Glad I found this thread was about to get new plugs!
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Old 09-10-2012, 10:48 AM   #113
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I just did mine too. Status of the ones that I pulled out was basically unknown, but didn't look bad. Aside from the gaps being all over the place. Some as much as .060, some as small as .025. I don't think the PO gapped them at all, just stuck them in. Oddly enough, he used dielectric grease on them, probably because the seller either gave it to him or recommended it.
I didn't use any grease, read that it's not needed in today's plugs.


My Jeep is running 100% better now, I installed a K&N air filter and autolite xp985 plugs and could not be happier...smoother idle, quicker acceleration, overall smoother. Very pleased!
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Old 09-10-2012, 03:00 PM   #114
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Quote:
Originally Posted by HarryJeepGuy View Post
I've been running the 7034's for a long time in my 01 and like them.
Thanks, think I can get 50K miles out of them?

I chucked the OEMs at 30k (looked terrible) and put in some 7034s. Just checked them at 70k and they look great.
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Old 07-05-2013, 06:54 AM   #115
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2004 LJ with a 4.0L. Changed plugs yesterday. I was experiencing a slight miss and rough idle. Particularly when warm. The Autolight AP-985's had about 40,000 miles on them and really didn't look all that bad.

Put in Autolite APP-985's (double platinum) and the miss went away and now she idles smooth.

What is the difference between the AP & APP-985's? They look the same? Anyone know?
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Old 07-05-2013, 09:11 AM   #116
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I'm a fan of iridium's for longevity. On my performance cars, I use Bosch and have been more than happy with both performance and fire, getting better combustion and better mpg (its a twin turbo, and secondary detonation is a death sentence to heads).

But we are talking Jeeps, which I am very new to. To those who use iridium, which plug are you happiest with?
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Old 07-05-2013, 09:33 AM   #117
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Glad I found this thread. Jeep is about to hit 70,000 mi, and I thought I would save time and drop it off for new plugs and oil change at local jeep dealership.

Called first and was advised it would be $129.00 to change the plugs. Taking a deep breath I confirmed 6cyl Jeep TJ wrangler......and was told the high cost was for "special plugs" needed by that model.

So much for saving some time......I'll grab the $30.00 in plugs and find the 45 minutes!

Is there a special tool needed to remove / insert the plug closest to the fire wall? I read here some had a hard time with it.
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Old 07-05-2013, 10:20 AM   #118
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What is the difference between the AP & APP-985's? They look the same? Anyone know?
Platinum is on just one side of the gap with the AP985, platinum is on both sides of the gap with the APP985. Distributorless 4.0L ignition systems used in 2000 and newer TJs require both sides of the gap be made from the same material.

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But we are talking Jeeps, which I am very new to. To those who use iridium, which plug are you happiest with?
Autolite's XP985 works very well.

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Is there a special tool needed to remove / insert the plug closest to the fire wall? I read here some had a hard time with it.
Where people sometimes have a little trouble is getting the plug at the front out, it is positioned under the a/c compressor or alternator. Using a 3/8" extension and wobble-joint/u-joint between the spark plug socket & extension makes that a much easier job. Getting the spark plug boots off can sometimes be a problem from engine heat causing them to stick. I finally broke down & bought a spark plug boot removal tool that helps break that seal so they can be pulled off more easily, they are like a pair of skinny pliers with vinyl covers over the gripper part.
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Old 07-17-2013, 07:22 AM   #119
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Platinum is on just one side of the gap with the AP985, platinum is on both sides of the gap with the APP985. Distributorless 4.0L ignition systems used in 2000 and newer TJs require both sides of the gap be made from the same material.

Autolite's XP985 works very well.

Where people sometimes have a little trouble is getting the plug at the front out, it is positioned under the a/c compressor or alternator. Using a 3/8" extension and wobble-joint/u-joint between the spark plug socket & extension makes that a much easier job. Getting the spark plug boots off can sometimes be a problem from engine heat causing them to stick. I finally broke down & bought a spark plug boot removal tool that helps break that seal so they can be pulled off more easily, they are like a pair of skinny pliers with vinyl covers over the gripper part.
Update on mileage. Went from 19.7 mpg to 21.2 mpg with the Autolite APP985's.
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Old 07-18-2013, 01:12 AM   #120
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Update on mileage. Went from 19.7 mpg to 21.2 mpg with the Autolite APP985's.
I call b.s. no way you're getting over 20.

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