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Old 02-18-2011, 09:37 AM   #1
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Time to change the plugs!

I am looking at E3 diamond fire plugs. Anyone using these? Im running bosch platinums now and havent had any problems with them. Was just wondering if they were worth the extra money.

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Old 02-18-2011, 09:44 AM   #2
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I believe that general consensus is that regular Champion or Autolite copper plugs are by far the best for your model year since it has the coil on plug setup. I'm sure that someone will chime in with the correct part numbers.

-Wes

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Old 02-18-2011, 09:50 AM   #3
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E3 plugs are just another overpriced gimmick spark plug. Plus they don't have the same material on both sides of the gap which will cause problems for your newer TJ's DIS igntion sytems. You can't go wrong with the very proven Champion 7034, Autolite APP985, or Autolite XP985... and any of those three dual-tipped platinum (the XP is Iridium) will easily last 100K miles. Be wary of one thing... your '03, and specifically its DIS (distributorless ignition system), is very fussy about the type of plugs it gets so you can't just run any, even a good quality, plug in it. But any of those three above mentioned plugs would be good choices.
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Old 02-18-2011, 10:07 AM   #4
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just put in the app985s this week

runs great
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Old 02-18-2011, 10:15 AM   #5
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I have the E3s. no noticeable difference on my 98.
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Old 02-18-2011, 10:18 AM   #6
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I have the E3s. no noticeable difference on my 98.
The early TJs from '97 to '99 are not fussy at all about the type of spark plugs they run on so I can imagine yours would run ok on the E3s. That is because they have conventional ignition systems with distributors.

The newer TJs with their distributorless igntion systems that fire their plugs twice as often and in alternating directions (with a "waste spark") are much fussier about the spark plugs they run on.
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Old 02-18-2011, 11:27 AM   #7
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Originally Posted by KP Texan View Post
I believe that general consensus is that regular Champion or Autolite copper plugs are by far the best for your model year since it has the coil on plug setup. I'm sure that someone will chime in with the correct part numbers.

-Wes
It appears that I was incorrect. Listen to Jerry and get the dual tipped platinum plugs from those manufacturers.

-Wes
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Old 02-18-2011, 11:55 AM   #8
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My Jeep is an 03 I don't think they haveeverbeen changed. Do u think its worth changing?
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Old 02-18-2011, 12:06 PM   #9
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The white underhood sticker - firewall, left side isn't there for decoration. It tells you what plugs it was designed to use. Make, number, and gap.
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Old 02-18-2011, 12:10 PM   #10
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My Jeep is an 03 I don't think they haveeverbeen changed. Do u think its worth changing?
The cheap factory installed conventional spark plugs only last half as long in newer jeeps like yours as they did before with conventional non-DIS ignition systems. If your jeep has over 25k miles, I would strongly consider changing the spark plugs
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Old 02-18-2011, 12:39 PM   #11
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Originally Posted by Jerry Bransford
The cheap factory installed conventional spark plugs only last half as long in newer jeeps like yours as they did before with conventional non-DIS ignition systems. If your jeep has over 25k miles, I would strongly consider changing the spark plugs
I have the 2.4L 4 cyc engine. Anyone have a good plugs to go with?
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Old 02-18-2011, 01:12 PM   #12
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When a plug wears, the gap gets wider. As it gets wider it takes more voltage to jump across it (required ionization voltage.)
More voltage means it takes more energy to do that (it operates higher up on the curve,) so the spark duration shortens - the time the spark actually jumps and starts the fire. Efficiency drops down, mileage suffers, emissions go up.

And the increased required voltage is what causes the weak coil rail to prematurely fail. (The rail's internal insulation is weak.)

If you want the coil rail to last - re-gap the plugs at least every 30,000 miles. Or use the factory recommended plugs on the underhood label and replace them at that time (cheaper anyway).
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Old 02-18-2011, 01:29 PM   #13
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I replaced mine with Champion 7034's like Jerry said. The jeep runs perfectly with those in. Make sure you check the gap - the original gap when I took them out of the little boxes was WAY off.
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Old 02-18-2011, 07:28 PM   #14
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When a plug wears, the gap gets wider. As it gets wider it takes more voltage to jump across it (required ionization voltage.)
More voltage means it takes more energy to do that (it operates higher up on the curve,) so the spark duration shortens - the time the spark actually jumps and starts the fire. Efficiency drops down, mileage suffers, emissions go up.

And the increased required voltage is what causes the weak coil rail to prematurely fail. (The rail's internal insulation is weak.)

If you want the coil rail to last - re-gap the plugs at least every 30,000 miles. Or use the factory recommended plugs on the underhood label and replace them at that time (cheaper anyway).
Rich, one of the advantage of dual-tipped platinum and iridium plugs is there is no gap erosion to worry about. At least not for the first 100K miles. Really. That's a huge benefit to using better plugs over plain old conventional copper core plugs.

"These Autolite Double Platinum spark plugs virtually eliminate plug gap erosion..." http://www.summitracing.com/search/B...iew=SKU&page=2
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Old 02-18-2011, 09:23 PM   #15
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owners manual calls for a plug change every 30,000 miles
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Old 02-18-2011, 09:33 PM   #16
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That may be true rather than just advertising hype. I can't testify it is or isn't. I put the Autolites in my '03 Rubi you recommended, but truthfully I haven't put many miles on it. It's has probably less than 400 miles on them - in 2+ months. My wife occasionally drives it to keep it "exercised" as she calls it. My legs and feet are going bad, I can hardly walk now, working a clutch is near impossible.

BTW - I replaced the new Autolite plugs in my motor home (Ford 460) with Champions. Runs fine now.

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