Your 3.8 and Spark Plugs. - JeepForum.com
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post #1 of 23 Old 11-10-2013, 10:34 AM Thread Starter
JTPhoto
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FYI for those thinking of changing plugs. I know this has been posted a few times here and there but I just wanted to throw in another account of why people suggest you stick with the factory spec Champion plug.

Today I Changed back to factory spec Champion plugs from NGK iridium. Tell tail sign was slowly decreasing fuel mileage over the last month and a half.

Original Champion plugs changed to NGK Iridium at 107,000 klm. NGK Iridium plugs are done already at 150,000klm (only 43,000 klm). By done I mean worn out. They look clean however, the gap is well over 0.060 upwards to 0.080". When I removed the original Champion plugs at twice the mileage they were no where near that far out.


^^Jeff^^
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
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post #2 of 23 Old 01-19-2014, 09:49 PM
Spook45
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yea, I switched to a Different plug and Im not thrilled with the results, I mean its not bad, but its not as good as it should be. Just crossed the 100k line so Im about to Wires and plugs and go back to the original hardware. Researching plug wires now, Leaning toward the BWDs from Oreillys(berg-Warner) but im still not sure.
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post #3 of 23 Old 01-20-2014, 01:29 AM
SubAtomicGenius
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Platinum, iridium, titanium, kryptonite... bunch of sales gimmicks to move expensive product. Can't beat the OEMs IMHO for price and performance.
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post #4 of 23 Old 01-20-2014, 03:31 AM
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Quote:
Originally Posted by SubAtomicGenius
Platinum, iridium, titanium, kryptonite... bunch of sales gimmicks to move expensive product. Can't beat the OEMs IMHO for price and performance.
If the oem could have produced more power or better economy simply by using a different plug, they would have used it.

Seems common on many brands. A lot of ford people had problems with aftermarket plugs not running in the correct heat range or something.
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post #5 of 23 Old 01-20-2014, 02:06 PM
SubAtomicGenius
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I don't trust plugs when the electrode is the size of a pin... gimme the OEMS.
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post #6 of 23 Old 01-20-2014, 03:22 PM
RockyClymer
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I generally agree, plugs are plugs, I used the NGK Iridiums because they came with my SC kit.

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post #7 of 23 Old 01-21-2014, 08:00 AM
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Interesting comments re: the iridiums. I'm only at 39k on my '09 but have been thinking about changing plugs & wires when it hits 50k. One of our club member's '08 started having a slight rough idle issue at 50k. It finally tripped a MIL code, misfire on #2. She replaced the OEM Champions with Autolite iridiums and the issue disappeared. Will be interesting to see how long they last.
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post #8 of 23 Old 01-22-2014, 12:30 PM
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Been running the Autolite Irdium's in mine forget the part number but, have put almost 20,000 on them no problems. Jeep runs very good. On a waste spark system you really want to at least run double platinums but, Iridiums are much better if you can afford them.

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post #9 of 23 Old 01-22-2014, 07:33 PM Thread Starter
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The NGK Iridiums were good, so I thought, until 43,000klm.

^^Jeff^^
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
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post #10 of 23 Old 01-17-2015, 11:28 AM
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Hey, I didn't want to make a whole new topic since it looks like it's been answered many times before, so here I go:

I was originally looking into getting the NGK spark plugs, but after doing research on here, I will be replacing the current plugs with OE ones. My question is regarding wires? I am not mechanically inclined, so do you think its a safe bet that I'll need new wires in addition to plugs?

2 door JK, 2009, I've had it since new, almost at 77k miles, starting to notice a severe decrease in MPG.

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post #11 of 23 Old 01-18-2015, 12:14 AM
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Quote:
Originally Posted by BobbySwiz View Post
Hey, I didn't want to make a whole new topic since it looks like it's been answered many times before, so here I go:

I was originally looking into getting the NGK spark plugs, but after doing research on here, I will be replacing the current plugs with OE ones. My question is regarding wires? I am not mechanically inclined, so do you think its a safe bet that I'll need new wires in addition to plugs?

2 door JK, 2009, I've had it since new, almost at 77k miles, starting to notice a severe decrease in MPG.
JMHO, but with every vehicle I've owned, I went ahead and swapped wires and plugs at the same time. Cheap insurance.

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post #12 of 23 Old 01-18-2015, 05:22 AM
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Quote:
Originally Posted by BobbySwiz
.... 2 door JK, 2009, I've had it since new, almost at 77k miles, starting to notice a severe decrease in MPG.
How severe is the decrease in mileage? Have you ruled out low tire pressure, etc.? Also, have you accounted for the drop in mpg due to winter-blend fuel? It seems my mileage drops as much as 3-4 mpg with the winter blend.

I agree with the others, I'll stick with the OE plugs and change the wires (OE) at the same time.
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post #13 of 23 Old 01-18-2015, 08:01 AM
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I too replace my plugs and wires together. Wires are pretty cheap for this.

On my first engine I had a bad plug and wire at 54k.

Any other symptoms besides the mileage decrease?

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post #14 of 23 Old 01-18-2015, 08:43 AM Thread Starter
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Do you have a check engine light on? If not probably won't help to change plugs, however it won't hurt either. I have original factory wires on my 08 and will be changing them soon as a preventative maintenance I'm at 189,000klm. Just changed my daughters plugs and wires on her 09 but hers was idling rough and had a check engine light on.

^^Jeff^^
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
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post #15 of 23 Old 01-19-2015, 09:55 AM
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I had swapped mine out along with my regular service. I went with the E3 spark plugs and they have worked great.

Jeremy
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