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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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<blockquote data-quote="1Graeman" data-source="post: 454544" data-attributes="member: 24579"><p>I just read all 6 pages of the issues and I, too have the 1,3,5 cylinder misfire at idle. I have a JScan tool and can watch it show misfires while at idle. I installed Accel coils and new spark plugs and noticed that the misfires still happen intermittently - not always cylinder 3 having the most misfires, etc.. Recently, I swapped out my O2 sensors with the Bosch ones because I was having O2 engine codes. Those codes went away and it drove fine with no O2 codes showing up. I also had a small evaporations leak code with I fixed with some silicone adhesive on the front tube on top of the intake( loose rubber hose fitting & leaking). I will order a new set of O2 sensors and replace them.</p><p>What I neglected to tell you all is this is on a new crate engine from Mopar with less than 10k miles on it. My original engine had a bad cylinder oil rings and I couldn't finance the Hemi swap so I went with another 3.6 engine installed at the dealership for $8k. They swap out all external parts from old engine to the new one. I knew the O2 sensors were bad from the oil leaking into the exhaust system from the old engine. So I purchased on Rockauto the Bosch ones. I will try the factory O2 sensors and check back in with you all.</p></blockquote><p></p>
[QUOTE="1Graeman, post: 454544, member: 24579"] I just read all 6 pages of the issues and I, too have the 1,3,5 cylinder misfire at idle. I have a JScan tool and can watch it show misfires while at idle. I installed Accel coils and new spark plugs and noticed that the misfires still happen intermittently - not always cylinder 3 having the most misfires, etc.. Recently, I swapped out my O2 sensors with the Bosch ones because I was having O2 engine codes. Those codes went away and it drove fine with no O2 codes showing up. I also had a small evaporations leak code with I fixed with some silicone adhesive on the front tube on top of the intake( loose rubber hose fitting & leaking). I will order a new set of O2 sensors and replace them. What I neglected to tell you all is this is on a new crate engine from Mopar with less than 10k miles on it. My original engine had a bad cylinder oil rings and I couldn't finance the Hemi swap so I went with another 3.6 engine installed at the dealership for $8k. They swap out all external parts from old engine to the new one. I knew the O2 sensors were bad from the oil leaking into the exhaust system from the old engine. So I purchased on Rockauto the Bosch ones. I will try the factory O2 sensors and check back in with you all. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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