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View Poll Results: How often do you replace spark plugs? (in miles)
5,000 or less 0 0%
5,000- 10,000 0 0%
10,000 - 15,000 1 7.14%
15,000 - 20,000 1 7.14%
20,000 - 25,000 3 21.43%
25,000 - 35,000 8 57.14%
35,000 - 50,000 0 0%
50,001 or more 1 7.14%
Voters: 14. You may not vote on this poll

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Unread 04-02-2014, 08:33 AM   #1
jp7794
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2006 KJ Liberty 
 
Join Date: Jul 2008
Location: MO
Posts: 303
Magic Mileage For Spark Plug Replacement

We all know that plugs in the KJ burn up quick and a new set can improve gas mileage considerably. That being said how often do you change your plugs?

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Unread 04-02-2014, 12:28 PM   #2
01CHEEKEE
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2004 KJ Liberty 
 
Join Date: May 2009
Location: PENNSYLVANIA
Posts: 661
Teh cooler are so cheap, it just makes sense to change moar often...
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Unread 04-02-2014, 07:35 PM   #3
tjkj2002
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2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,083
Can't state a mileage but I change mine every October regardless of mileage,copper core Champions only.For $10 and 20mins of work why not.
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Unread 04-04-2014, 03:34 PM   #4
DaveJKJ
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2005 KJ Liberty 
 
Join Date: Nov 2008
Location: stuck in the mud again
Posts: 1,084
Change approximately every 30,000 miles with the OEM spec NGK copper core plugs. No issues, easy to change, and not expensive.
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Unread 04-07-2014, 09:50 PM   #5
Clockworkorange
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2006 KJ Liberty 
 
Join Date: May 2007
Location: Hamilton Ontario Canada
Posts: 85
Original plugs with 86,000 miles (l39,000 KM)

Pulled em 3 times over the years and just cleaned them in the sand blaster. That little hand held jobby for spark plugs that you attach to an air hose.
Set the gap to spec. .o40". I want to see if I can get 100,000 miles out of the original plugs. I know that they are cheap to replace but why throw out something that I can adjust to perfect spec. They are showing wear now though so I will probably just get one more clean & gap out of them.
Now if the fuel mileage was suffering I would replace them but my mileage has been stable in the 6 years that I have owned it.
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Unread 04-08-2014, 08:32 AM   #6
tommudd
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2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,194
Would never run them that long, even cleaning etc. mines every 25,000 on the average since new , now at 197,000
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Unread 04-08-2014, 10:30 AM   #7
DaveJKJ
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2005 KJ Liberty 
 
Join Date: Nov 2008
Location: stuck in the mud again
Posts: 1,084
Quote:
Originally Posted by Clockworkorange View Post
Pulled em 3 times over the years and just cleaned them in the sand blaster. That little hand held jobby for spark plugs that you attach to an air hose.
Set the gap to spec. .o40". I want to see if I can get 100,000 miles out of the original plugs. I know that they are cheap to replace but why throw out something that I can adjust to perfect spec. They are showing wear now though so I will probably just get one more clean & gap out of them.
Now if the fuel mileage was suffering I would replace them but my mileage has been stable in the 6 years that I have owned it.
I used to do that sometimes years ago but haven't done it in many years. I would only clean and re-gap them one time though. I finally figured it was not worth it and just get new ones. The copper-core NGK's are not expensive anyway.
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