Changing spark plugs - JeepForum.com

 
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post #1 of 8 Old 01-15-2014, 12:54 PM Thread Starter
MKWrangler
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Changing spark plugs

Hello all, I have 71k miles on my 08 and I decided to check the plugs. The two plugs I checked have rounded electrodes and a .055 gap. I know the recommended mileage is 100k but I have decided to change the spark plugs. I am considering NGK Iridiums. Alot of people recommend staying with the factory Champion double platinums, but I'm wondering if anyone has run the NGK iridiums without fail. I have generally owned Toyota vehicles in the past and NGK plugs work excellent in those. Thanks in advance.

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post #2 of 8 Old 01-15-2014, 03:38 PM
RockyClymer
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I now run the NGK Iridium plugs with no problems. I do however run a slightly cooler plug due to the SC.

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post #3 of 8 Old 01-15-2014, 11:07 PM
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I put in NGK Iridium plugs.. They lasted about 25,000 miles before fuel mileage started to drop off. Checked the plugs they were toast, gap was up to 70th + on all plugs. Stick with the factory Champion Platinum plugs.

^^Jeff^^
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
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post #4 of 8 Old 01-16-2014, 04:44 AM
Wrigley
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Quote:
Originally Posted by MKWrangler View Post
Hello all, I have 71k miles on my 08 and I decided to check the plugs. The two plugs I checked have rounded electrodes and a .055 gap. I know the recommended mileage is 100k but I have decided to change the spark plugs. I am considering NGK Iridiums. Alot of people recommend staying with the factory Champion double platinums, but I'm wondering if anyone has run the NGK iridiums without fail. I have generally owned Toyota vehicles in the past and NGK plugs work excellent in those. Thanks in advance.
Stick with factory plugs. You'll be happy you did!

Mike
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post #5 of 8 Old 01-16-2014, 08:37 AM
zpayne08
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How hard is it to change plugs in the 3.6? I won't need it for several year but it would be nice to know. I came from a 5.4 3v f150 and plugs were a nightmare due to their two piece construction. Do they use coils or plug wires?
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post #6 of 8 Old 01-16-2014, 10:45 AM Thread Starter
MKWrangler
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Quote:
Originally Posted by JTPhoto View Post
I put in NGK Iridium plugs.. They lasted about 25,000 miles before fuel mileage started to drop off. Checked the plugs they were toast, gap was up to 70th + on all plugs. Stick with the factory Champion Platinum plugs.
Did you gap the plugs at .050 when they where installed? That sounds odd for Iridiums to increase gap that substantially. I even looked into Champion Iridium plugs, but they are a special order and I didn't want to wait.
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post #7 of 8 Old 01-16-2014, 10:46 AM Thread Starter
MKWrangler
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Quote:
Originally Posted by zpayne08 View Post
How hard is it to change plugs in the 3.6? I won't need it for several year but it would be nice to know. I came from a 5.4 3v f150 and plugs were a nightmare due to their two piece construction. Do they use coils or plug wires?
Not sure about the 3.6, the motor involved in this discussion is a 3.8
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post #8 of 8 Old 01-16-2014, 02:07 PM
JTPhoto
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Quote:
Originally Posted by MKWrangler
Did you gap the plugs at .050 when they where installed? That sounds odd for Iridiums to increase gap that substantially. I even looked into Champion Iridium plugs, but they are a special order and I didn't want to wait.
I sure did. Always check and gap new plugs before instal. I was also surprised however this seems to be really common problem.

^^Jeff^^
2008 Black and Khaki Sahara Unlimited Trax-Lok rear diff. 3.5" Rock Krawler fr springs, rear TeraFlex 2.5 BB, 37x12.50x17 Pitbull Rockers on ProComp 7069 Alloys, AEV Prem Bumper ETC..
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