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  #13  
Old 10-17-2016, 11:56 PM
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Awsome, good luck.

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  #14  
Old 10-18-2016, 12:04 AM
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Re: Miss fire

Thanks I'll need it i think .it is still waiting for them to fix the 2012 recall it had on the air bag system lol
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  #15  
Old 10-18-2016, 06:04 PM
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Re: Miss fire

The after cat O2 sensors are not used for the fuel trimming, only for measuring the efficiency of the cats. If they don´t work (well), the engine should perform normally.
Mopar is not the manufacturer of the sensors, but they use Denso on the WJ. I bought new Denso sensors for around USD 25 each via internet. Other brand sensors (like Bosch) heat up more slowly and the PCM interprets this as a failure.
Hard starting can be caused by various reasons. Is it allways hard to start, cold and hot? If you prime the fuel system three times before starting, does that make any difference?
If not, have a look at the inlet temp sensor value, to see if its not far of.
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  #16  
Old 10-18-2016, 06:10 PM
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Re: Miss fire

Ok so I'll talk to my local denso sales rep. Would that be the same as the fuel pump have to be OE as every time I shut the wj off the fuel go's back to the tank
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  #17  
Old 10-18-2016, 09:16 PM
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Re: Miss fire

If the fuel returns to the tank, then it will take a few seconds to start the engine. The problem can be with the fuel filter/pressure regulator, or inside the pump unit. There can be an O´ring internally in the fuel pump unit which breaks and lets the fuel return. I have installed a non OEM pump unit, after my fuel pump went south, and it works perfectly, eventhough with more noise then the original one.
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Old 10-18-2016, 09:56 PM
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Re: Miss fire

Replaced the pump and regulator when I got it back from the shop after 1 1/2 years and that's when it started to play up so I replaced the regulator again last week and it is still not holding any fuel so I think it might be a pump problem. So you think if the pump might have been missing a seal or its just stuffed
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  #19  
Old 10-19-2016, 08:49 PM
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Re: Miss fire

The pump module has a spring loaded upper part, which keeps the unit fixed inside the tank. There is an o-ring which slides inside the spring loaded upper part. I don´t think that the seal is missing, but maybe its cut or broken. A missing seal most probably would result in a too low fuel pressure.
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  #20  
Old 10-19-2016, 09:07 PM
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Re: Miss fire

Ok so not a real hard job to pull apart and replace the o rings. I just called jeep in Australia and they told me i can't get a fuel pump repair kit so I should be able to get the stuff from any parts store right
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  #21  
Old 10-20-2016, 05:32 PM
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ok guys found my p0320 issue and it may relate to your 02 sensor issue. look at the harness where it connects to the pcm. the one beside the coolant overflow. Check the wiring where it hangs down by the shock stud peel some of the loom back and look for chaffing. That's what has caused my crank sensor fail.

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  #22  
Old 10-20-2016, 05:48 PM
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Re: Miss fire

Ok I can do that want would of cause that to happen. I went to a few auto parts store last night and was told they they don't do fuel pump repair kit any more and got the same response from jeep can I buy the parts separately
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  #23  
Old 10-20-2016, 06:02 PM
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Well the brains at jeep decided it would be a good idea to run the harness for the pcm next to the shock stud and the wires were rubbing on the stud. I repaired the bad spot with electrical tape and added more loom then wrapped it with more tape to help insulate the harness then I took a rubber vacuum cap and pushed it on the stud. no more problems.
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  #24  
Old 10-21-2016, 07:04 AM
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Re: Miss fire

Just finished checking all them wires and they all look good and no damage so I'll start to drop the tank tomorrow and pull the pump out
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