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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="MDuncan" data-source="post: 425314" data-attributes="member: 18634"><p>Hi Folks,</p><p></p><p><strong>Looking for your expertise. </strong></p><p></p><p>The problem: Random Misfires on cylinders 1,3,5 - Confirmed with Scanner</p><p>The Jeep: 2012 JKU 6-Speed, 108K miles</p><p>How long: I've been trying to fix this: 9 months</p><p></p><p>It's hard to feel the misfire when under throttle, but you can hear and feel the slight misfire trembles when at idle.</p><p></p><p><u>What I've tried so far:</u></p><p>- New Spark Plugs: (2 set's - 6 NKG & 6 Champion) Properly Gapped</p><p>- New Coils: MSD</p><p>- New O2 Sensors (all 4 - both sides)</p><p>- New Crankshaft Position Sensor</p><p>- New MAP Sensor</p><p>- All new Rocker Arms and Lifters on that bank (Cyl 1,3,5)</p><p>- New Camshaft Position Sensor</p><p>- New Injector on Cyl 5 = No change still misfiring</p><p>- New upper and lower o-rings for injectors</p><p>- New upper and lower o-rings for Lower and Upper Manifolds</p><p></p><p><u>Tests Completed:</u></p><p>- Leakdown Test Showed Normal</p><p>- Rotated Coils - No Change</p><p>- Rotated Plugs - No Change</p><p>- Camshafts inspection - no flat spots found</p><p></p><p><u>Additional Modifications Possibly Affecting Performance:</u></p><p>Mishimoto Oil Catch Can</p><p>Banks CAI</p><p>Odyssey Battery</p><p></p><p><u>Additional Fixes Completed on Motor:</u></p><p>- New Oil Pressure Sensor</p><p></p><p></p><p>Friends,</p><p>Please help. I love my jeep, and I want to drive it to 300k miles and drop in a Hemi and keep driving it.</p><p></p><p>(Wave),</p><p>Matt</p></blockquote><p></p>
[QUOTE="MDuncan, post: 425314, member: 18634"] Hi Folks, [B]Looking for your expertise. [/B] The problem: Random Misfires on cylinders 1,3,5 - Confirmed with Scanner The Jeep: 2012 JKU 6-Speed, 108K miles How long: I've been trying to fix this: 9 months It's hard to feel the misfire when under throttle, but you can hear and feel the slight misfire trembles when at idle. [U]What I've tried so far:[/U] - New Spark Plugs: (2 set's - 6 NKG & 6 Champion) Properly Gapped - New Coils: MSD - New O2 Sensors (all 4 - both sides) - New Crankshaft Position Sensor - New MAP Sensor - All new Rocker Arms and Lifters on that bank (Cyl 1,3,5) - New Camshaft Position Sensor - New Injector on Cyl 5 = No change still misfiring - New upper and lower o-rings for injectors - New upper and lower o-rings for Lower and Upper Manifolds [U]Tests Completed:[/U] - Leakdown Test Showed Normal - Rotated Coils - No Change - Rotated Plugs - No Change - Camshafts inspection - no flat spots found [U]Additional Modifications Possibly Affecting Performance:[/U] Mishimoto Oil Catch Can Banks CAI Odyssey Battery [U]Additional Fixes Completed on Motor:[/U] - New Oil Pressure Sensor Friends, Please help. I love my jeep, and I want to drive it to 300k miles and drop in a Hemi and keep driving it. (Wave), Matt [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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