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Jeep Wrangler JK Resources
JK How-to Guides
How to change spark plugs and spark plug wires on a Jeep Wrangler JK 3.8
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<blockquote data-quote="72c10" data-source="post: 433870" data-attributes="member: 19352"><p>Great write up, it gave me the courage to tackle this today... after a couple of months of stewing over it, wondering if the PO changed the plugs (I bought the Jeep from a dealer at 118K mi/now has 122k). A guy bought factory Champion plugs for the JK and Amazon sent him a double order and told him to keep it... he sold them to me for $6 <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3993" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>1. I almost took the fender off, but I wanted to challenge myself. Success. I just unpluged the air filter and heater hose to move them out of the way. </p><p></p><p>2. I used a 2" extension for the passenger side and a 12" extension for the driver side. </p><p></p><p>3. 45 min later, I got them swapped. </p><p></p><p>Damn.... idle is 50-75% smoother. Acceleration is smoother. </p><p></p><p>I don't think the PO changed the plugs at 100-102K miles like he/she should've. Here's a pic. If he changed them at 60k mi like some may do, would they look like this (see pic)? The gaps were estimated to range from .060 to .075. I only wonder, because the rest of the JK has been cosmetically and mechanically maintained.</p><p></p><p>[ATTACH=full]117717[/ATTACH]</p></blockquote><p></p>
[QUOTE="72c10, post: 433870, member: 19352"] Great write up, it gave me the courage to tackle this today... after a couple of months of stewing over it, wondering if the PO changed the plugs (I bought the Jeep from a dealer at 118K mi/now has 122k). A guy bought factory Champion plugs for the JK and Amazon sent him a double order and told him to keep it... he sold them to me for $6 :) 1. I almost took the fender off, but I wanted to challenge myself. Success. I just unpluged the air filter and heater hose to move them out of the way. 2. I used a 2" extension for the passenger side and a 12" extension for the driver side. 3. 45 min later, I got them swapped. Damn.... idle is 50-75% smoother. Acceleration is smoother. I don't think the PO changed the plugs at 100-102K miles like he/she should've. Here's a pic. If he changed them at 60k mi like some may do, would they look like this (see pic)? The gaps were estimated to range from .060 to .075. I only wonder, because the rest of the JK has been cosmetically and mechanically maintained. [ATTACH=full]117717[/ATTACH] [/QUOTE]
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Jeep Wrangler JK Resources
JK How-to Guides
How to change spark plugs and spark plug wires on a Jeep Wrangler JK 3.8
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