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Jeep Wrangler JK
JK General Discussion
Misfire that resets when battery cable pulled
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<blockquote data-quote="CDNbigfoot" data-source="post: 431876" data-attributes="member: 20342"><p>My 2012 JK is running rough and throwing codes. (170,000km)</p><p>P0430 - Catalyst Efficiency (Bank 2)</p><p>P0152 - O2 sensor Bank 2 sensor 1 Circuit high.</p><p>P0300 - multiple cylinder misfire.</p><p></p><p>Has just started with this code for a first time P258B Electric Vacuum Pump Performance.</p><p></p><p>Now the Jeep is running extremely rough with a flashing engine light.</p><p>Unable to reset the codes with my BlueDriver OBD2 reader so I pulled the battery cable and it temporarily solved all issues, ran great for 200+ kms until I turned off the engine. On warm restart the codes and rough running engine returned. Another battery cable pull and Jeep runs perfect again until it is turned off. Every time I reset the codes it runs fine for a while.</p><p></p><p>The history of this Jeep is a little complicated.</p><p>6 years ago. After blowing a rad in a bad snow storm due to a rock and having to drive a was to get to a safe place engine seriously overheated. Result was a new rad and still disappearing coolant. Heads were determined to be warped or porous and replaced.</p><p>4 past years, several times Jeep service has cleaned throttle body, replaced B2/1 O2 sensor and replaced left side head under warranty for "cylinder head issues that result in a loss of compression and subsequent misfires. While it seems to have been a quality control issue, Chrysler is replacing cylinder heads under warranty."</p><p>In the last year I have replaced the B2/1 O2 sensor for P0152 and P0302 misfire. Seemed to solve the problem for awhile.</p><p></p><p>I don't recall if spark plugs have ever been done.</p><p>I think I will replace spark plugs and coil packs.</p><p>Do I need new Cats and O2 sensors?</p><p>I don't understand why it runs perfectly after pulling battery cable to clear the codes. </p><p>PCM issue?</p><p></p><p>Any other suggestions?</p></blockquote><p></p>
[QUOTE="CDNbigfoot, post: 431876, member: 20342"] My 2012 JK is running rough and throwing codes. (170,000km) P0430 - Catalyst Efficiency (Bank 2) P0152 - O2 sensor Bank 2 sensor 1 Circuit high. P0300 - multiple cylinder misfire. Has just started with this code for a first time P258B Electric Vacuum Pump Performance. Now the Jeep is running extremely rough with a flashing engine light. Unable to reset the codes with my BlueDriver OBD2 reader so I pulled the battery cable and it temporarily solved all issues, ran great for 200+ kms until I turned off the engine. On warm restart the codes and rough running engine returned. Another battery cable pull and Jeep runs perfect again until it is turned off. Every time I reset the codes it runs fine for a while. The history of this Jeep is a little complicated. 6 years ago. After blowing a rad in a bad snow storm due to a rock and having to drive a was to get to a safe place engine seriously overheated. Result was a new rad and still disappearing coolant. Heads were determined to be warped or porous and replaced. 4 past years, several times Jeep service has cleaned throttle body, replaced B2/1 O2 sensor and replaced left side head under warranty for "cylinder head issues that result in a loss of compression and subsequent misfires. While it seems to have been a quality control issue, Chrysler is replacing cylinder heads under warranty." In the last year I have replaced the B2/1 O2 sensor for P0152 and P0302 misfire. Seemed to solve the problem for awhile. I don't recall if spark plugs have ever been done. I think I will replace spark plugs and coil packs. Do I need new Cats and O2 sensors? I don't understand why it runs perfectly after pulling battery cable to clear the codes. PCM issue? Any other suggestions? [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Misfire that resets when battery cable pulled
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