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Jeep Wrangler JK
JK General Discussion
P306 Error code on 2016 JK
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<blockquote data-quote="Duster" data-source="post: 461089" data-attributes="member: 20812"><p>It sounds, from what you say, as if the rough idle goes away after it warms up. That <em>could</em> mean the spark is weak for some reason. I would suggest first clearing the code. Then starting the engine from a cold state. Wait for the rough idle, or check engine light to come back. Immediately stop the engine. My personal first step would be to pull the plug and check its state; wet with fuel, showing carbon, etc. If it is, check the gap first. There is a possibility you changed the gap accidentally while changing the plugs. If the plug is OK, then you move on to the coil and wire. Swap them with a neighbor cylinder, start the engine and see if the rough idle is still there, and if the CEL comes back. If the CEL shows, does the code move to the cylinder you moved the wire and coil to. If it does, you have your solution. If it doesn't, I would head for a mechanic who knows his stuff.</p></blockquote><p></p>
[QUOTE="Duster, post: 461089, member: 20812"] It sounds, from what you say, as if the rough idle goes away after it warms up. That [I]could[/I] mean the spark is weak for some reason. I would suggest first clearing the code. Then starting the engine from a cold state. Wait for the rough idle, or check engine light to come back. Immediately stop the engine. My personal first step would be to pull the plug and check its state; wet with fuel, showing carbon, etc. If it is, check the gap first. There is a possibility you changed the gap accidentally while changing the plugs. If the plug is OK, then you move on to the coil and wire. Swap them with a neighbor cylinder, start the engine and see if the rough idle is still there, and if the CEL comes back. If the CEL shows, does the code move to the cylinder you moved the wire and coil to. If it does, you have your solution. If it doesn't, I would head for a mechanic who knows his stuff. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
P306 Error code on 2016 JK
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