02 Liberty: Best Spark Plugs? - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 17 Old 06-26-2013, 12:15 AM Thread Starter
Spetznaz24
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2011
Location: SI
Posts: 13
02 Liberty: Best Spark Plugs?

I have a 2002 Jeep Liberty 3.7

Haven't changed the spark plugs in 4-5 years and want to do so now.

Which are the best plugs to use? I am thinking of Bosch Iridium Plugs.

Is there a a better alternative? Are the stock MOPAR OEM Plugs just as good?

Thanks

Spetznaz24 is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 06-26-2013, 01:39 AM
jbarthol
Registered User
2005 KJ Liberty 
 
Join Date: Nov 2012
Location: Cedar Falls
Posts: 121
Avoid iridium, and platinum like the plague. Go with copper core at least, at best use what is printed on the sticker. The techs who fix these engines, will be on shortly(usually),to tell of the problems iridium, and platinum has had with these engines. Also change them ASAP, the plugs should be changed every 30000 miles. After 4-5 years, if you drive like my family your well past that.
jbarthol is offline  
post #3 of 17 Old 06-26-2013, 04:03 AM
tommudd
Registered User
2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Kilimanjaro,Tanzania
Posts: 5,566
Champion coppers best plug
4-5 years
They're cheap/easy to change
I do mine every 25,000

04 KJ 4.5 JBA lift, 03 KJ 2.5 JBA coilovers,
tommudd is offline  
post #4 of 17 Old 06-26-2013, 06:58 AM
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Castle Pines
Posts: 3,078
I know I didn't just hear someone say bosch and spark plugs in the same sentence on a jeep site. Yeah Jbarthol called it, some of us would be on here to say do not use bosch anything that screws into the engine. Even euro trash is going to other brands. NGK coppers are the exact OE plug, and most KJs have the part number on the emissions sticker even. Some don't like NGKs, and use Champions. The 4.7L(sister engine) uses Champions as their oe plug. The only real difference is a slightly different heat range. Iridium and platinum plugs are good plugs, in the engines that require them. Gaps have to be different than copper plugs due to a difference in performance. Our engines run best on plain old cheap copper plugs, and take 20 minutes to change, every 30k. Not a hard job.
streetglideok is offline  
post #5 of 17 Old 06-26-2013, 10:14 AM Thread Starter
Spetznaz24
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2011
Location: SI
Posts: 13
Thanks for the responses.

My local auto zone has the Autolite Copper Plugs. Would these be fine? Or should I try to find Champion or NGK?
Spetznaz24 is offline  
post #6 of 17 Old 06-26-2013, 11:24 AM
DaveJKJ
Registered User
2005 KJ Liberty 
 
Join Date: Nov 2008
Location: stuck in the mud again
Posts: 1,091
Quote:
Originally Posted by Spetznaz24 View Post
Thanks for the responses.

My local auto zone has the Autolite Copper Plugs. Would these be fine? Or should I try to find Champion or NGK?
NAPA carries the NGK copper core plugs and I have been using those as they are OEM spec. Several changes with no issues. Just my experience.

War Veterans Jeep Group #31
Black Jeep Society #217
DaveJKJ is offline  
post #7 of 17 Old 06-26-2013, 11:44 AM
ppap
Registered User
2004 TJ Wrangler 
 
Join Date: May 2013
Location: Cape Cod
Posts: 39
Quote:
Originally Posted by DaveJKJ View Post
NAPA carries the NGK copper core plugs and I have been using those as they are OEM spec. Several changes with no issues. Just my experience.
Exactly... The Liberty came stock with those and they work great. Why would you risk the unknown?!? I believe in buying OEM parts whenever possible.
ppap is offline  
post #8 of 17 Old 06-26-2013, 12:20 PM
tommudd
Registered User
2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Kilimanjaro,Tanzania
Posts: 5,566
unknown??
Oh well

04 KJ 4.5 JBA lift, 03 KJ 2.5 JBA coilovers,
tommudd is offline  
post #9 of 17 Old 06-26-2013, 07:58 PM
DarkSport11
Registered User
2011 KK Liberty 
 
Join Date: Mar 2013
Location: Farmingville
Posts: 205
NGK V-Power ZFR6F-11G (#6987) .044 Gap. Torque to 20 FT/LBS.
DarkSport11 is offline  
post #10 of 17 Old 06-26-2013, 08:12 PM
tjkj2002
Registered User
2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,369
Quote:
Originally Posted by Garnet02Sport View Post
NGK V-Power ZFR6F-11G (#6987) .044 Gap. Torque to 20 FT/LBS.
Being you have a '02 also might want to recheck what you wrote as far as gap goes.



And it's 15lbs-ft,not 20.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
tjkj2002 is offline  
post #11 of 17 Old 06-26-2013, 09:23 PM
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Castle Pines
Posts: 3,078
Quote:
Originally Posted by Spetznaz24 View Post
Thanks for the responses.

My local auto zone has the Autolite Copper Plugs. Would these be fine? Or should I try to find Champion or NGK?
First mistake, bautozone. They only carry a few brands of parts, and will tell you anything to get you to buy their garbage. Find a new parts store is your first order of business.
streetglideok is offline  
post #12 of 17 Old 06-26-2013, 10:19 PM
DarkSport11
Registered User
2011 KK Liberty 
 
Join Date: Mar 2013
Location: Farmingville
Posts: 205
Quote:
Originally Posted by tjkj2002 View Post
Being you have a '02 also might want to recheck what you wrote as far as gap goes.



And it's 15lbs-ft,not 20.
Page 8I-3 of the 2002 Daimler Chrysler Liberty Service Manual states 20 ft. lbs. of torque for the 3.7L engine and 15 ft. lbs. for the 2.4L engine. It also states 0.042 in. for the spark plug gap. My local Jeep dealer's Service Dept. said 0.044 in. is the correct gap for the plugs.
DarkSport11 is offline  
post #13 of 17 Old 06-26-2013, 10:43 PM
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Castle Pines
Posts: 3,078
Quote:
Originally Posted by Garnet02Sport View Post
Page 8I-3 of the 2002 Daimler Chrysler Liberty Service Manual states 20 ft. lbs. of torque for the 3.7L engine and 15 ft. lbs. for the 2.4L engine. It also states 0.042 in. for the spark plug gap. My local Jeep dealer's Service Dept. said 0.044 in. is the correct gap for the plugs.
And typically, there is a note, to see the emission sticker for vehicle specific info. 0.040" is spec. Also, right out of Mitchell Ondemand5, 20ft-lb torque spec, and 0.040" gap. This info is taken from the OE.
streetglideok is offline  
post #14 of 17 Old 06-27-2013, 06:29 AM
DarkSport11
Registered User
2011 KK Liberty 
 
Join Date: Mar 2013
Location: Farmingville
Posts: 205
Double checked under the hood this morning and the sticker says .040, pulled them out and re-gapped them and torqued to 20 ft. lbs. as per spec. So much for listening to the service guy at the dealer. Never noticed the info was right on the sticker.
DarkSport11 is offline  
post #15 of 17 Old 06-27-2013, 07:01 AM
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Castle Pines
Posts: 3,078
Service writers usually have no clue, and are the last place to get info from. Lately I've seen service guys tell anyone all sorts of BS that comes in or calls with a question.
streetglideok is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome