OE NGK plugs from a 2006 4.0 Jeep 204,314 miles!

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Originally Posted By: GMBoy
All the Jeeps I've ever owned and worked on used Champions. My last Cherokee, 2001 4.0L came with copper Champions and my current 2014 Grand Cherokee has Champions. I think those are not the OEM plugs - they've been replaced somewhere along the line.

I looked it up, and quite a few Mopar spark plugs are literally just NGKs in a Mopar box without any relabeling of the plug. I thought they might be the platinums - especially NGK Laser Platinum, which seemed to be a pretty popular OEM plug. Those have bigger platinum spots and generally resist erosion better than platinum plugs with tiny platinum wires.

Also - how many of these engines were from the DaimlerChryler years?
 
Wow....were they a son-of-a-gun to get out?
That porcelain looks a bit cracked.

Got the plugs in my car changed about a month ago. Needed a new coil so I did the plugs at the same time.

NGK
 
Yikes, ~204k miles and look every bit of it. That's as bad a sparks anecdote as I've seen posted here, amazing it was running as well as you say.

So is it running significantly better now and code now fixed? I'd hope so. Fwiw, NGK Iridium IX my go to plugs.
 
Wow, I'm surprised it ran as good as you said. I wonder if the oil suffered any fuel dilution from those bad plugs.
 
Amazing that it ran.

Years ago my mother had a 2.8L Jeep that wouldn't run worth beans--idled fine, but no power. I started my debug by pulling spark plug wires. IIRC it idled with no change with 2 wires pulled. ! Sure enough, plugs like in the picture came out.
 
Originally Posted By: Brybo86
Saved for reference.

HOLY SMOKES!

You sure the engine ran before they were pulled?
I've seen worse but only after catastrophic failure like broken timing belt, con rod etc.


It was running, otherwise I'd have had to push it through the test drive and then into my shop! LOL!


Originally Posted By: y_p_w
So they are labeled as NGK? I thought maybe Chrysler would do something like slap the Mopar name on them and give them a Mopar part number.

Was the ceramic cracked during removal?

Originally Posted By: GMBoy
All the Jeeps I've ever owned and worked on used Champions. My last Cherokee, 2001 4.0L came with copper Champions and my current 2014 Grand Cherokee has Champions. I think those are not the OEM plugs - they've been replaced somewhere along the line.


Those are the correct, and OE plugs for that Jeep. When I went to the parts lookup for price and availability, I always look for what they say is OE- and it was the NGK. Also under the hood on the emissions tag the NGK number is listed, not Champion- so that is what it got for replacements. Believe me when I say that I was as surprised as you.

Originally Posted By: Sayjac
Yikes, ~204k miles and look every bit of it. That's as bad a sparks anecdote as I've seen posted here, amazing it was running as well as you say.

So is it running significantly better now and code now fixed? I'd hope so. Fwiw, NGK Iridium IX my go to plugs.


You know... not really. It starts and idles nicer for sure, but I didn't really notice a huge change going down the road. But then again it has a pretty borked rear track bar bushing and mount (imagine that on a super short wheel base vehicle), bad sway bar links and a howling rear differential... so I was a bit distracted.
 
Originally Posted By: SaturnIonVue

Goodness! It looks like #1 and #4 only fired in self defense.


LOL!!!
 
Originally Posted By: Skid
My Dad's 2005 Toyota Sienna is on its original rear bank plugs still. It just threw a code for misfire at 295,700. When I get around to changing the plugs, I'll post pics.


At least that thing likely has some kind of long life plug it- but still... Near 300K? WOW!


Originally Posted By: demarpaint
Wow, I'm surprised it ran as good as you said. I wonder if the oil suffered any fuel dilution from those bad plugs.


Dunno? It was in for an oil change too, but I've gotten pretty unceremonious about oil changes so I just pulled the plug and let er drain. I will say that it didn't look like it had fuel in it. When oil gets fuel in it, it will often leave a weird coating on my drain pan. It's hard for me to describe/define.
 
Originally Posted By: SR5
Wow....were they a son-of-a-gun to get out?
That porcelain looks a bit cracked.

Got the plugs in my car changed about a month ago. Needed a new coil so I did the plugs at the same time.

NGK



The porcelain is cracked due to using a cordless impact on them. It rattled a little and then spun them out.
 
Keeping plugs in this long is nothing but a false economy and it's also extremely hard on your ignition system ...Likely wasted hundreds or thousands of dollars in lower fuel economy
 
I don't disagree!


The gal is a back up rural mail carrier and this Jeep have have been bought used? I don't know... So it definitely gets miles! But it has never complained until recently, so I don't think she ever knew any different.
 
Originally Posted By: Bluestream
Keeping plugs in this long is nothing but a false economy and it's also extremely hard on your ignition system ...Likely wasted hundreds or thousands of dollars in lower fuel economy

It wasn't his car.

I found a PNW emissions sticker for a 2007 Jeep. Definitely an NGK number. Still just one version. My '89 Integra had a list with 9 different ND and NGK plugs. It was 3 heat ranges, with NGK listed for V-Power or standard.

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Originally Posted By: SirTanon
Impressive. Not the longest I've seen a set of plugs go, but still definitely impressive. They Gave their all.

Years ago I read a piece in Autoweek where one of the editors went on a cultural exchange trip to Cuba. It was centered around the car culture in Cuba. He wanted to bring a gift and the value was limited by the Treasury Dept, so he found some used Autolite plugs in his garage.

When he gave them, the recipient looked at them like he was handed gold. Wherever they went, I'd think they were used until there was nothing left. I'm sure that it was possible to get a suitable replacement plug, but possibly out of the reach of the average American classic car owner there.
 
I'm having top cap corrosion problems with NGKs. IRIDIUM and copper, both corrode and gives misfires on my coil on plugs. They have aluminum coils terminals. But other brands like Bosch don't corrode like NGKs.
 
Originally Posted By: GMBoy
All the Jeeps I've ever owned and worked on used Champions. My last Cherokee, 2001 4.0L came with copper Champions and my current 2014 Grand Cherokee has Champions. I think those are not the OEM plugs - they've been replaced somewhere along the line.


Those are OEM. The coil on plug update was done to some of the 4.0 engines in 1999. In 2002 or so they started using NGKs as standard equipment. I guess they performed better than the Champions? Before that, Champions were OE.
 
Originally Posted By: Bluestream
Keeping plugs in this long is nothing but a false economy and it's also extremely hard on your ignition system ...Likely wasted hundreds or thousands of dollars in lower fuel economy


Would you say the same thing if the plugs were iridium, and fuel economy was still excellent even at 200,000 miles on them?
 
Originally Posted By: SirTanon
Originally Posted By: Bluestream
Keeping plugs in this long is nothing but a false economy and it's also extremely hard on your ignition system ...Likely wasted hundreds or thousands of dollars in lower fuel economy


Would you say the same thing if the plugs were iridium, and fuel economy was still excellent even at 200,000 miles on them?
that would depend on the condition and how they looked...200,000 is more than enough use even for iridium
 
Originally Posted By: Bluestream
Originally Posted By: SirTanon
Originally Posted By: Bluestream
Keeping plugs in this long is nothing but a false economy and it's also extremely hard on your ignition system ...Likely wasted hundreds or thousands of dollars in lower fuel economy


Would you say the same thing if the plugs were iridium, and fuel economy was still excellent even at 200,000 miles on them?
that would depend on the condition and how they looked...200,000 is more than enough use even for iridium


Here you go. Have a look.
 
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