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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="Rdartua" data-source="post: 443543" data-attributes="member: 22557"><p>Wait - I did not say it was one stop issue. It keeps misfiring Cyl 1 and 2 at idle all the time. As soon as I raise idle speed top say 850 misfire goes away. Btw - I am one of those guy who either replaced parts with OEM mopar or superior. - NGK spark, MSD Coils, upgraded Oil filter housing - oem new from 2017, all sensors either oem or bosch, or NTK - which actually make for Mopar. So inferior quality is certainly not an issue. Plus I threw parts at is as also part of 100k maintenance. Live data and freeze frame I am running off WiTech software using high end MichroPod clone which runs wiTech perfectly. </p><p></p><p>So as you can see I am b***ls deep into the issue. That being said Jeep has been sitting at dealership since Friday with no resolution, they called me to say they want to keep longer, I said as long as you need - so maybe another week. It has their tech stumped and I think he is taking it personally ;-) - like I did. Will see what pans out. </p><p></p><p>BUT - why i suspected valve train - is potentially low idle rocker wobble? Couldn't be oil actuators? What would cause misfire on low RPM - what actually happens at low speed? Wiring I eliminated by tracing back to PCM, PCM I swapped same issue - so I have trouble believing its electric. </p><p></p><p>Btw - below is another thread dealing with the same issue with no resolve.:</p><p></p><p>[URL unfurl="true"]https://www.wranglerforum.com/threads/annoying-never-ending-p0301-calling-all-jeepers-for-advice.2419449/#post-35119386[/URL]</p></blockquote><p></p>
[QUOTE="Rdartua, post: 443543, member: 22557"] Wait - I did not say it was one stop issue. It keeps misfiring Cyl 1 and 2 at idle all the time. As soon as I raise idle speed top say 850 misfire goes away. Btw - I am one of those guy who either replaced parts with OEM mopar or superior. - NGK spark, MSD Coils, upgraded Oil filter housing - oem new from 2017, all sensors either oem or bosch, or NTK - which actually make for Mopar. So inferior quality is certainly not an issue. Plus I threw parts at is as also part of 100k maintenance. Live data and freeze frame I am running off WiTech software using high end MichroPod clone which runs wiTech perfectly. So as you can see I am b***ls deep into the issue. That being said Jeep has been sitting at dealership since Friday with no resolution, they called me to say they want to keep longer, I said as long as you need - so maybe another week. It has their tech stumped and I think he is taking it personally ;-) - like I did. Will see what pans out. BUT - why i suspected valve train - is potentially low idle rocker wobble? Couldn't be oil actuators? What would cause misfire on low RPM - what actually happens at low speed? Wiring I eliminated by tracing back to PCM, PCM I swapped same issue - so I have trouble believing its electric. Btw - below is another thread dealing with the same issue with no resolve.: [URL unfurl="true"]https://www.wranglerforum.com/threads/annoying-never-ending-p0301-calling-all-jeepers-for-advice.2419449/#post-35119386[/URL] [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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