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View Poll Results: What Spark Plug is Preferred?
Autolite APP985 1 14.29%
Champion 7034 1 14.29%
NGK V-Power 3459 0 0%
Other 5 71.43%
Multiple Choice Poll. Voters: 7. You may not vote on this poll

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Old 03-13-2014, 07:55 AM   #1
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Spark Plugs: 1998 TJ 2.4L 4cyl

I have searched and scanned numerous threads about spark plugs, none offer any comfort to the question they are all started with,

What Spark Plugs Will Work Best?

I feel there are so many different opinions because everyone uses their jeep in different ways. This thread sadly will not be the be all end all to this question, but I hope to at least get one answer.

As the subject reads I have a 1998 TJ. I believe it is the 2.4 (maybe 2.5) Liter engine, with 4 cylinders. This jeep sees the road for near only 2,000 - 5,000 miles a year. It is a secondary vehicle and only used for fun. The reason I am changing the spark plugs is, I plan on "SeaFoam"ing the Jeep this weekend. I am told an Oil change and Spark Plug swap is recommended as there will be a severe amount of crud left behind.

I've read that some prefer the copper plugs, yet are impossible to find factory stock. I've read that some prefer the double platinum. The trade off as far as I can tell is, Copper runs better but Double Platinum lasts longer. Being that this is a weekend type vehicle, what would you all recommend I grab for my new Spark Plug?

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Old 03-13-2014, 08:11 AM   #2
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I use these in My 99 2.5...


What's on the sticker under the hood?

I had trouble with misfires with the autolites ap985 and app985

Champion 3034 and 7034 ran fine

I think it runs better with the NGK, I've had them in for 15k miles so far...

I've had my Jeep for 170k miles so I've tried every plug recommendation.

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Old 03-13-2014, 08:24 AM   #3
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I don't know why I put 3459 down instead of the 7252, thats the one I was leaning towards. Thanks for the input.

I will have to check the sticker when I am home.
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Old 03-13-2014, 03:51 PM   #4
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Use Autolite AP985. APP985 is double platinum tipped. AP985 is what I run and they work great.
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Old 03-13-2014, 03:52 PM   #5
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Btw, I've got the same engine as you. It's a 2.5L. The 2.4L was introduced later.
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Old 03-13-2014, 07:10 PM   #6
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Thanks ginsu. Just looked at the sticker it says "RC12LYC" not sure what those compare to. But thanks again
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Old 03-13-2014, 08:49 PM   #7
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Originally Posted by Bullethead View Post
Thanks ginsu. Just looked at the sticker it says "RC12LYC" not sure what those compare to. But thanks again
Champion has an rc12lyc, which is what is printed on my sticker, and thats what I use.
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Old 03-13-2014, 09:11 PM   #8
Knows a couple things...

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Your 2.5L would run great on the Champion 3034 or Autolite AP985, either of which will perform extremely well for 100k miles. The slightly more expensive Champion 7034 and Autolite APP985 you have in your survey would work as well but those two plug models are really meant more for 2001 and newer 4.0L engines that have distributorless ignition systems.

Champion's RC12LYC would work ok but its life is only about 1/3 the Autolite AP985 or Champion 3034.

There would be literally no benefit to running the 7034 or APP985 over the less expensive 3034 or AP985.

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