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Jeep Wrangler JK
JK General Discussion
2016 JKU performance problem
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<blockquote data-quote="Fishhead69" data-source="post: 427088" data-attributes="member: 19084"><p>Just purchased my first Jeep, thinking i got screwed!</p><p></p><p>A week after i got it home it started running rough like a misfire while driving around town, smooths our after a bit on the freeway. No check engine light, threw a scanner at it and the dreaded P0300 code.. no other codes though.. Heard about the technical service bulletin so took it in and the dealer flashed the Computer, ran butter but started throwing the same code and still no check engine light!! Pulled live data, B1 O2 sensors, both of them, intermittently drop to 0 volts, ding heard from the dash, they come back online, ding, they go out ding, on and on. Looked up </p><p></p><p>Advanced diagnostics data and this is what I see:</p><p></p><p>[ATTACH=full]115980[/ATTACH]</p><p></p><p></p><p>Any ideas?? I’m thinking ECM is bad? Or hopefully massive vacuum leak? But why is my check engine light not coming on, even during initial start up.</p></blockquote><p></p>
[QUOTE="Fishhead69, post: 427088, member: 19084"] Just purchased my first Jeep, thinking i got screwed! A week after i got it home it started running rough like a misfire while driving around town, smooths our after a bit on the freeway. No check engine light, threw a scanner at it and the dreaded P0300 code.. no other codes though.. Heard about the technical service bulletin so took it in and the dealer flashed the Computer, ran butter but started throwing the same code and still no check engine light!! Pulled live data, B1 O2 sensors, both of them, intermittently drop to 0 volts, ding heard from the dash, they come back online, ding, they go out ding, on and on. Looked up Advanced diagnostics data and this is what I see: [ATTACH type="full" alt="DA6FB9D0-455B-4BD8-8747-3976ECFC8344.png"]115980[/ATTACH] Any ideas?? I’m thinking ECM is bad? Or hopefully massive vacuum leak? But why is my check engine light not coming on, even during initial start up. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
2016 JKU performance problem
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