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Jeep Wrangler JK
JK General Discussion
Misfire on cylinders 1, 3, and 5 on 2012 Jeep Wrangler JK
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<blockquote data-quote="jszeinstra" data-source="post: 441773" data-attributes="member: 22288"><p>New to the forum. Had a 2007 jk loved it drove it 150k miles and loved it but I wanted a stick..... and then traded for a 2012. Had a nagging issue ever since I got it in the spring. stock 108 k miles.</p><p></p><p>Check engine, throwing bank 1 too rich and lots of Missfires on 1 3 5 Found another post in here with the same exact issue and same steps so far but did not put a solution. Leaning toward wiring issue.</p><p></p><p><u>What I've tried so far:</u></p><p>- New Spark Plugs:</p><p>-Checked Coils, and swapped all look good</p><p>- New O2 Sensors (all 4 - both sides)</p><p>- New Crankshaft Position Sensor</p><p>- New MAP Sensor</p><p></p><p>- New Camshaft Position Sensor</p><p>- New Injector on Cyl 1 = 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></p><p>Cleaned the main wiring harness on the top, reseated the PCM and don't see anything major but my guess is it is a manufacturing issue and someone else out there has the same rubbing wire....</p><p></p><p></p><p></p><p>Checked Cat for plug with a pressure gauge, checked compression on all 3 and good. cleared PCM and the issue will come and go at random. </p><p></p><p></p><p>Leaning towards a wiring issue and will look one more time at the injector rail and the harness along there. Made an appointment with a local shop as well in 2 weeks, but in the meantime might take a look again at it. Also don't want to throw anything more at it without really knowing the issue. </p><p></p><p>Thanks. Love my jeep.... She'll get fixed someday lol</p><p></p><p>Jason</p></blockquote><p></p>
[QUOTE="jszeinstra, post: 441773, member: 22288"] New to the forum. Had a 2007 jk loved it drove it 150k miles and loved it but I wanted a stick..... and then traded for a 2012. Had a nagging issue ever since I got it in the spring. stock 108 k miles. Check engine, throwing bank 1 too rich and lots of Missfires on 1 3 5 Found another post in here with the same exact issue and same steps so far but did not put a solution. Leaning toward wiring issue. [U]What I've tried so far:[/U] - New Spark Plugs: -Checked Coils, and swapped all look good - New O2 Sensors (all 4 - both sides) - New Crankshaft Position Sensor - New MAP Sensor - New Camshaft Position Sensor - New Injector on Cyl 1 = No change still misfiring - New upper and lower o-rings for injectors - New upper and lower o-rings for Lower and Upper Manifolds Cleaned the main wiring harness on the top, reseated the PCM and don't see anything major but my guess is it is a manufacturing issue and someone else out there has the same rubbing wire.... Checked Cat for plug with a pressure gauge, checked compression on all 3 and good. cleared PCM and the issue will come and go at random. Leaning towards a wiring issue and will look one more time at the injector rail and the harness along there. Made an appointment with a local shop as well in 2 weeks, but in the meantime might take a look again at it. Also don't want to throw anything more at it without really knowing the issue. Thanks. Love my jeep.... She'll get fixed someday lol Jason [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Misfire on cylinders 1, 3, and 5 on 2012 Jeep Wrangler JK
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