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Jeep Wrangler JK
JK General Discussion
#5 cylinder misfire & secondary coil ground fault
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<blockquote data-quote="M&amp;M&#039;s13JKUS" data-source="post: 439576" data-attributes="member: 21887"><p>Howdy!</p><p></p><p>I'm an old school diesel guy, so I'm a bit out of my depth.</p><p></p><p>Just bought our first wrangler. 2013 jku Sahara manual 38,00 mi. Love it except for this issue which has me bewildered.</p><p></p><p>I've replaced the spark plugs with ngk ones. Swapped the coils from 1 to 5 and the problem remained. @ no. 5. That's when I notice somebody did a hack-job trying to splice a "new" coil plug-end into the wiring harness. Im pretty sure the bare wires made contact. (I'm guessing the original plug end may have gotten damaged so it was necessary to replace trying not to do the whole harness) I have since attempted a nicer repair with butt splice crimp connectors, ALSO it sounds like bad rocker arms with the pentastar "tapping" sound.</p><p></p><p>The check engine light will come on right away or as many as 40 miles after being cleared. It seems to trigger more quickly when running the air conditioner? I haven't gotten a FSM yet, but I have some theories on what may be the cause:</p><p></p><p>*ECM - why problem so spuratic.</p><p>*Vacuum leak.</p><p>*Bad injector #5</p><p>*Valve issue in #5 because of the rockers or other compression problem.</p><p></p><p>With the factory wiring having been compromised for reasons I am un-aware, I wonder if the wiring harness may need to be replaced?</p><p></p><p>PLEASE any of you tinkerers out there! Anything to try or test I'll do if i am capable.</p></blockquote><p></p>
[QUOTE="M&M's13JKUS, post: 439576, member: 21887"] Howdy! I'm an old school diesel guy, so I'm a bit out of my depth. Just bought our first wrangler. 2013 jku Sahara manual 38,00 mi. Love it except for this issue which has me bewildered. I've replaced the spark plugs with ngk ones. Swapped the coils from 1 to 5 and the problem remained. @ no. 5. That's when I notice somebody did a hack-job trying to splice a "new" coil plug-end into the wiring harness. Im pretty sure the bare wires made contact. (I'm guessing the original plug end may have gotten damaged so it was necessary to replace trying not to do the whole harness) I have since attempted a nicer repair with butt splice crimp connectors, ALSO it sounds like bad rocker arms with the pentastar "tapping" sound. The check engine light will come on right away or as many as 40 miles after being cleared. It seems to trigger more quickly when running the air conditioner? I haven't gotten a FSM yet, but I have some theories on what may be the cause: *ECM - why problem so spuratic. *Vacuum leak. *Bad injector #5 *Valve issue in #5 because of the rockers or other compression problem. With the factory wiring having been compromised for reasons I am un-aware, I wonder if the wiring harness may need to be replaced? PLEASE any of you tinkerers out there! Anything to try or test I'll do if i am capable. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
#5 cylinder misfire & secondary coil ground fault
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