Best Spark Plugs for 2.4L; Same as for 6 Cyl? - JeepForum.com

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post #1 of 17 Old 10-04-2004, 01:27 PM Thread Starter
Whytep38
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Best Spark Plugs for 2.4L; Same as for 6 Cyl?

I searched for spark plug info, and everything I found mention the Champion truck plugs for the 6 cylinder engine. Do the 4 cylinder and 6 cylinder engines use the same plug?

Thanks.

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post #2 of 17 Old 10-05-2004, 03:08 PM
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[QUOTE=Whytep38]I searched for spark plug info, and everything I found mention the Champion truck plugs for the 6 cylinder engine. Do the 4 cylinder and 6 cylinder engines use the same plug?

I suggest you use NGK #LZTR4A-11 plugs.
This is what the dealer put in when one of the OEM Champion #RE14MCC5 plugs failed at 12,000 miles.
You can get the NGKs from:
WWW.sparkplugs.com
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post #3 of 17 Old 10-05-2004, 03:18 PM
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Champion truck plugs get lots of recommendations here. Stay away from anything with platinum as those are terrible in the 6-cyl.
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post #4 of 17 Old 10-05-2004, 05:16 PM Thread Starter
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Thanks for the info, guys.
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post #5 of 17 Old 10-05-2004, 05:38 PM
Coils Rule
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Champion all the way in your jeep. Stay away from brands not reccomended for your vehicle (such as NGK or others). Same deal as only using AC Delco in GM it is a no brainer. SImply put it is what your engine was designed to use.
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post #6 of 17 Old 10-05-2004, 08:06 PM
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Quote:
Originally Posted by Whybu1
Stay away from anything with platinum as those are terrible in the 6-cyl.
Are platinums bad for a 4-cyl too? Why are they bad?
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post #7 of 17 Old 10-05-2004, 11:57 PM
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I don't know why ther bad in the 4.0 but I can tell you I put the Bosch Platinum plus 4 in my 98 ZJ and it killed the performance. I had damn near 50 bucks in the plugs and got worse fuel milage and less power. Go figure. I went to the Champion Truck Plugs and the power and mileage returned. Expensive lesson. I have no idea why this happened but I've read this same thing several times on forums.

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post #8 of 17 Old 10-06-2004, 08:49 AM
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Same as above post for the 6-cyl. They somehow rob performance and gas mileage in Jeeps. Worked great in my Saab but not the TJ.
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post #9 of 17 Old 10-06-2004, 01:16 PM Thread Starter
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So what's the number for the Champion truck plugs for a 2.4L? Every search I've done on this site and others lists the Champion truck plug number for a 4.0L, but not for a 2.4L, which is what I have. My other searches show NGK/ND/Accel/Bosch plugs for the 4.0L are different than those for the 2.4L. Based on that info, I'm thinking the two engines use different plugs.

But the one thing I can't find is the only thing I'm searching for: the right Champion truck plug for my 2.4L. If I could get that info, I'd be grateful.

Thanks in advance.
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post #10 of 17 Old 10-06-2004, 03:06 PM
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Truck Plugs

[QUOTE=Whytep38]So what's the number for the Champion truck plugs for a 2.4L? Every search I've done on this site and others lists the Champion truck plug number for a 4.0L, but not for a 2.4L, which is what I have. My other searches show NGK/ND/Accel/Bosch plugs for the 4.0L are different than those for the 2.4L. Based on that info, I'm thinking the two engines use different plugs.
But the one thing I can't find is the only thing I'm searching for: the right Champion truck plug for my 2.4L. If I could get that info, I'd be grateful. [Quote]

You're right, the plugs for the 2.4L motor in the 2003 and up Wrangler SE are completely different than the plugs for the six cylinder motor.
The number for the OEM Champion plug in the 2.4L is RE14MCC5.
When the Champion plugs fail (there is a TSB on this so a number of them must be failing), the dealer special orders, directly from DXC, the NGK #LZTR4A-11 under part number SP-LZTR4A-11. The "SP" stands for "service part" but the plug is the same one you can buy from Sparkplugs.com.
DXC is replacing the Champion plugs with NGK plugs for a reason.
I don't know for sure, but I doubt that there is a "truck" version of the OEM plug available.
I suggest you go with the NGK plugs.
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post #11 of 17 Old 10-06-2004, 03:53 PM Thread Starter
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Sounds good, SpitNine. Thanks for confirming what I suspected. I'll get the NGKs.
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post #12 of 17 Old 10-07-2004, 11:47 AM
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This is one guy telling you to use NGK. Do yourself a favor and go with the masses on this one Champion only bro. I have made the mistake of putting "expensive" plugs in my rigs before, not a good plan. I did a TSB search for faulty champion plugs and came up with nothing for the 4 or 6 cyl jeep applications. NGK makes great plugs for bikes and Hondas but not your jeep. Even though the jeep may run great with other plugs in it you have no idea how hot or cold it is sparking in comparison to the factory champion reccomended plug. Could possibly damage your engine without you knowing it. I say better safe than sorry.
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post #13 of 17 Old 10-07-2004, 12:57 PM
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NGK Plugs

Quote:
Originally Posted by Coils Rule
This is one guy telling you to use NGK. Do yourself a favor and go with the masses on this one Champion only bro. I have made the mistake of putting "expensive" plugs in my rigs before, not a good plan. I did a TSB search for faulty champion plugs and came up with nothing for the 4 or 6 cyl jeep applications. NGK makes great plugs for bikes and Hondas but not your jeep. Even though the jeep may run great with other plugs in it you have no idea how hot or cold it is sparking in comparison to the factory champion reccomended plug. Could possibly damage your engine without you knowing it. I say better safe than sorry.
All I can say is that my 2.4L Jeep runs just fine with the NGK plugs that DXC directly supplied to the DEALER who then installed them to replace the failing OEM Champion plugs. The TSB number is 08-034-03. You can bet when it comes time for new plugs, I will install NGKs. I have never had an NGK plug fail in any kind of engine. I have had several Champion plugs fail in several different kind of engines. Two plugs (different part numbers, different times) failed brand new right out of the box.
BTW, the #LZTR4A-11 plugs are not "'expensive"' in any way.
Thanks.

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post #14 of 17 Old 10-07-2004, 01:03 PM
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At this point, go with what you want. If they don't work, then your only out $10. I went with Champion truck plugs in my 4.0 from the advice on this forum. Had Bosch platinum before. Gas mileage has dropped 2 mpg, but there does feel like a small power gain and smoother idle when cold. It only cost me $15 to try them. I'll probably try something else.
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post #15 of 17 Old 10-07-2004, 01:09 PM
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People you are talking about two very different engines. I agree Champion Truck Plugs are the best plugs for the 4.0L but the 2.4L is not a truck engine. The Dodge Stratus uses it as its base engine. It is a high reving 4cyl very different to the 4.0L and the old 2.5L the 2.4L replaced. Go to Stratusphere and ask them what they use in their 2.4L engines or just go and get plugs from the dealer.

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