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Unread 03-30-2014, 06:18 AM   #31
Walston
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2002 KJ Liberty 
 
Join Date: Sep 2009
Location: Ohio
Posts: 30
Well reading this thread inspired me to check mine. I bought this Jeep a few years ago for my daughter and it came with a book of all the maintenance that has been done. Seemed very thorough, many pages but I never read all the details. I assumed it had platinum plugs and gas mileage around town was about 15.

So I started through the details yesterday. The freaking spark plugs have never been changed. 148,000 miles on the original plugs. The gaps were almost an 1/8". I can't believe the thing ran, let alone ran pretty well. Take a look!

I put the new plugs (exact same ones) back in, if they worked that well that long, no sense in changing.

photo-35.jpg  
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Unread 03-30-2014, 06:42 AM   #32
02blue
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2002 KJ Liberty 
 
Join Date: Aug 2011
Location: Frederick, MD
Posts: 339
Back when I first got my 02 I immediately changed items like plugs and fluids. Mine looked just like those. Guess they were originals also with 80k on them. Couldn't really figure how it was running at all. Sort of scary but most of the other maintenance on mine seemed to be done in a timely manner since the fluids all looked like they had been changed on time.
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Unread 03-30-2014, 06:55 AM   #33
tommudd
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2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,178
Lots of people for some reason think plugs will last 100,000 miles or more .
Heck I changed mine the first time at about 22,000 , then every 25,000 after that so easy to do on the KJs and with copper plugs being inexpensive why not
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Unread 03-30-2014, 11:02 AM   #34
satgdave
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2005 KJ Liberty 
 
Join Date: Nov 2013
Posts: 97
I got Bosch 4+ in mine what is better +4 or iridium?
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Unread 03-30-2014, 11:05 AM   #35
tommudd
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Quote:
Originally Posted by satgdave View Post
I got Bosch 4+ in mine what is better +4 or iridium?
Motor is designed for a copper plug, anything else is a waste of money.
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Unread 03-30-2014, 11:12 AM   #36
satgdave
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I think the +4 are junk personally I don't even see them for sale anymore?
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Unread 03-30-2014, 11:14 AM   #37
satgdave
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I put iridium in my mothers car and Im aware it has 20 more horses Can tell by going up hills compared to oem
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