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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="stephenspann27" data-source="post: 459499" data-attributes="member: 25007"><p>Similar to what someone else posted on this thread. If I reset the ecu, I don’t get any misfires until the second run cycle. I also found that if I unplug the map sensor, I don’t get any misfires. I assume that open loop is running a richer mixture ? I replaced the map sensor with a new one and had no change. I also have a long crank tilt when the engine is heat soaked. I’ve been thinking about maybe using a programmer, or have someone tune the engine. Maybe richen the mixture at idle.</p></blockquote><p></p>
[QUOTE="stephenspann27, post: 459499, member: 25007"] Similar to what someone else posted on this thread. If I reset the ecu, I don’t get any misfires until the second run cycle. I also found that if I unplug the map sensor, I don’t get any misfires. I assume that open loop is running a richer mixture ? I replaced the map sensor with a new one and had no change. I also have a long crank tilt when the engine is heat soaked. I’ve been thinking about maybe using a programmer, or have someone tune the engine. Maybe richen the mixture at idle. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
3.6 Pentastar Misfire on Cylinders 1, 3, & 5
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