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  #25  
Old 04-12-2015, 06:49 PM
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Yes did everything you said and still getting p0051 and Jeep still doing the same,this didn't start til after I drove it hard the day before it started this,I got three mechanic saying catalytic converter and one said intake need gaskets!

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  #26  
Old 04-12-2015, 07:04 PM
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Re: idle issue

So there is still a problem with the O2 sensor heater (or with the PCM) Did you use Denso O2 sensors? Bosch sensors are good, but are slower to heat up and can set a fault code because of that.
I still wonder why a catalytic converter would give a problem when hot and not when cold. If its plugged, it should be plugged all the time and also give more problems at higher rpm then at idle.
If there is an inlet leak, then its a good idea to fix that, eventhough i won´t expect it to solve the erratic idle.
Did the mechanics explain their ideas about the catalytic converter(s) being the problem? Your jeep has the two pre-cats and an other one close to the silencer?
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  #27  
Old 04-12-2015, 07:12 PM
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Yes I used denso so I should check the pcm, and this one guy said something about a coolant temp sensor.
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  #28  
Old 04-12-2015, 07:39 PM
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But it stop the p0302 and just give the poo51 now my dad. Had a car that was doing this and he took the catalytic off and it stopped,that why I asked
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  #29  
Old 04-12-2015, 10:04 PM
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Re: idle issue

Quote:
Originally Posted by Mr Cox View Post
But it stop the p0302 and just give the poo51 now my dad. Had a car that was doing this and he took the catalytic off and it stopped,that why I asked
I just wonder why a problem with a catalytic converter would throw an O2 heater message. The P0051 message is set by the PCM when it doesn´t see the expected voltage drop over the O2 sensor. This means normally or the sensor, fuse, wiring or PCM.
Engine coolant sensor information is indeed used by the PCM to calculate the fuel injector pulses, but also several other sensors are used for this. Is the engine coolant indicator working normally?
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  #30  
Old 04-13-2015, 12:13 PM
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Yes,and I changed the coils around but before I changed them I did the key dance and it didn't come back but I swap them anyway but the p0051 keep coming up!
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  #31  
Old 04-13-2015, 12:15 PM
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The temp went up once do to being low heater core bad so I by passed it.
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  #32  
Old 04-13-2015, 10:28 PM
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Re: idle issue

This engine doesn´t like to be overheated. It will warp the heads and can cause the valve seats to drop, so be aware.
For the P0051 you will have to measure the wiring from the O2 sensor to the PCM. You will have to measure the heater wires for continuity, but also short to ground.
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  #33  
Old 04-15-2015, 06:22 PM
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This was the code I had got p0320 not p0302,something about the crankshaft sensor!
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  #34  
Old 04-15-2015, 07:01 PM
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Re: idle issue

trouble shooting becomes difficult when the wrong fault codes are used.
Ok, the P0320 indeed is a fault code for the crank sensor circuit. That the problem starts after heating up the engine also points towards the crank sensor. It most probably is the sensor itself, however i would check the wiring as far as possible from the sensor to the PCM. The crank sensor sits just above the starter motor, which is mounted to the transmission bell housing on the right hand side (as seen from drivers position). You will have to remove the starter motor to get access to the crank sensor. If you are going to change the sensor, then you best go with Mopar, since parallel sensors are known to give problems.
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