looking to replace my spark plugs....as i understand the liberty doesnt have traditional spark plug wires, just wondering if it is routine to throw in new ignition coils with the new spark plugs. thanks for any help in advance, just cant find a clear answer elsewhere.

Nope no need to change the coils until one fails.


Make sure you replace the plugs with the OE type plugs,mainly make sure there copper core and gapped correctly(0.040"-0.043").

alright thanks a lot. these are the plugs i was planning on using....and now its even more affordable if its only plugs!
http://napaonline.com/Catalog/CatalogIt ... 0169521838

NGK is a good plug. I’m hoping to get 100,000 miles out of my NGK Iridium’s.

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2015 Ram Ecodiesel/Big Horn/4x4/Quad Cab
2016 Arctic Fox 22G/Onboard 2500 LP Cummins Onan Generator/160 Watt Solar Panel

I took the road less traveled. Now I'm LOST.

100,000 ?
I've never trusted a spark plug that long
Guess I just like to swap things out more than normal

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

If I were running a standard plug, then I would want to change them at 40,000 mile intervals. I pulled the OE plugs around 25,000 miles and they looked good. The Iridium can handle heat better and do not corrode or get the electrical wear as quickly as the standard plugs. Plus, “the center electrode of Iridium IX spark plugs has an extra anti-fouling mechanism. A thermo edge between the center electrode and the insulator nose provides a gap for a secondary micro-discharge to jump and initiate a self-cleaning process.” I agree that 100,000 miles is taking plugs to an extreme mileage, especially for how cheap they are to replace. But I think the Iridiums could last that long in good working condition. I guess I will find out, lol. Heck, there are people on this forum who haven't replaced their stock spark plugs with over 80,000 miles on their KJ.

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2015 Ram Ecodiesel/Big Horn/4x4/Quad Cab
2016 Arctic Fox 22G/Onboard 2500 LP Cummins Onan Generator/160 Watt Solar Panel

I took the road less traveled. Now I'm LOST.

Yes that is true have read some where they have 100,000 and original plugs, ( now gapped at .80 )

_________________
MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

If they they are set at the gap I think they are about 30k-40k and they will be done,either that or the coils will be.

Just remember our ignition system is designed for copper plugs and switching to platinum or iridium changes the resistance in the system.To low of resistance(not copper core plugs) will cause a very high voltage spark which will erode at a higher rate,not good for the coils either.


If you want to run platinum plugs the gap needs to be set at about 0.060" and 0.080" for iridiums to be about the same resistance as copper core plugs gapped at 0.040".

I just use the NGK copper core plugs and get them from NAPA for around $18 or so and change them at around every 30K or so. Never had any trouble and still running the factory coil-paks. The plugs are not hard to change. But that's me.

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05 BLACK KJ - 42RLE & NP242
Skids, Hooks, Bent Rock Rail, Lifted, A/T's, etc.
NY and PA and Florida ONF Special Custom Organic Trail Rash