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Jeep Wrangler YJ
YJ General Discussion
Engine cutting out after warm up
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<blockquote data-quote="HDSlowride" data-source="post: 432379" data-attributes="member: 19912"><p>I did put off my trip for a day or two just because I am still trying to get to the root cause of this issue. It definitely begins missing at the point the engine gets warm and the PCM shifts from Open Loop to Closed Loop fuel injection. It does the same exact thing every time. Runs ok for a few minutes while the engine is cold and then when it warms up and moves to a closed loop fuel injection sequence, it starts missing.</p><p>So I changed the MAP sensor and the oxygen sensor, thinking that one of these would be likely culprits for giving bad info to the PCM in closed loop. Did not help or change a thing.</p><p>I changed the fuel filter on the off chance that it may not be supplying enough flow to the fuel rail. Again, no change.</p><p>I put in a new crank position sensor. No change or improvement. When it starts missing after warm up, I can turn the key off for a few seconds and then back on and bump start it. This must trigger it back to open loop condition because it will run fine for just a couple minutes. Until the PCM realizes it is warmed up and tries going back to closed loop operation.</p><p>I do have a new coil to change out but have run out of time and it will have to wait until I get back from my trip, first of December.</p><p></p><p>After having changed out most all the items that I can think of that effect the info the PCM needs to operate correctly in closed loop operation, maybe it is the PCM after all. I'm sure someone, somewhere has experienced this identical issue!</p><p></p><p>I'll be checking in often to see what other advice comes and trying to sort through these issues. Thanks again for all the helpful advice.</p></blockquote><p></p>
[QUOTE="HDSlowride, post: 432379, member: 19912"] I did put off my trip for a day or two just because I am still trying to get to the root cause of this issue. It definitely begins missing at the point the engine gets warm and the PCM shifts from Open Loop to Closed Loop fuel injection. It does the same exact thing every time. Runs ok for a few minutes while the engine is cold and then when it warms up and moves to a closed loop fuel injection sequence, it starts missing. So I changed the MAP sensor and the oxygen sensor, thinking that one of these would be likely culprits for giving bad info to the PCM in closed loop. Did not help or change a thing. I changed the fuel filter on the off chance that it may not be supplying enough flow to the fuel rail. Again, no change. I put in a new crank position sensor. No change or improvement. When it starts missing after warm up, I can turn the key off for a few seconds and then back on and bump start it. This must trigger it back to open loop condition because it will run fine for just a couple minutes. Until the PCM realizes it is warmed up and tries going back to closed loop operation. I do have a new coil to change out but have run out of time and it will have to wait until I get back from my trip, first of December. After having changed out most all the items that I can think of that effect the info the PCM needs to operate correctly in closed loop operation, maybe it is the PCM after all. I'm sure someone, somewhere has experienced this identical issue! I'll be checking in often to see what other advice comes and trying to sort through these issues. Thanks again for all the helpful advice. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Engine cutting out after warm up
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