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Old 04-26-2014, 09:39 PM
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P0300 05 Jeep Grand Cherokee

I have a 2005 Jeep Grand Cherokee with the 3.7L, and keep getting the P0300 code, I changed the plugs, Coil packs, Injectors, and just cant get it resolved, it starts out running great and after warmed up and you stop for 10 min. or so it will loose power and the check engine light will blink a few times and then stays on and code reader says P0300 every time, does anyone have any ideas of what could be causing this.

Thanks For any help!
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Old 04-26-2014, 09:49 PM
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Re: P0300 05 Jeep Grand Cherokee

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Originally Posted by Dentmon View Post
I have a 2005 Jeep Grand Cherokee with the 3.7L, and keep getting the P0300 code, I changed the plugs, Coil packs, Injectors, and just cant get it resolved, it starts out running great and after warmed up and you stop for 10 min. or so it will loose power and the check engine light will blink a few times and then stays on and code reader says P0300 every time, does anyone have any ideas of what could be causing this.

Thanks For any help!
Has it ever over heated for any length of time or ever? If so, did this issue start happening after?
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Old 04-26-2014, 09:57 PM
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Re: P0300 05 Jeep Grand Cherokee

No it has never over heated, I checked all vacuum lines and nothing wrong, fuel pressure is perfect compression is perfect on all cylinders.
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Old 04-27-2014, 09:56 AM
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Re: P0300 05 Jeep Grand Cherokee

Coil packs and injectors rarely fail. Usually it's something like a cam or crank sensor, a bad ground somewhere, or maybe a poor connection on some component(s). Have you isolated which cylinder(s) are misfiring? Is it the same ones all the time? Does the misfire occur right from initial startup, or after it reaches a certain operating temperature? When it occurs, is it continuous or does it ever "smooth" out?
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Old 04-28-2014, 09:55 AM
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Re: P0300 05 Jeep Grand Cherokee

I have replaced all the ground cables on the jeep, Checked and cleaned all plug connections, It only ever comes up with P0300 never a distinct cylinder and only after it is at operating temp and then shut down after about 10 min or so restart and then it does it, it only does it once and after it corrects it runs great.
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Old 05-04-2014, 03:30 PM
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Re: P0300 05 Jeep Grand Cherokee

Still nothing, this jeep is driving me crazy..
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Old 05-08-2014, 07:17 PM
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Re: P0300 05 Jeep Grand Cherokee

P0300 (random misfire) codes can be caused by a lean mixture. If you have a scanner which shows live data, then you can see what the fuel trims are. If you have a STFT (short term fuel trim) which shows double digit negative at the moment the misfire happens, then a lean misfire is probably your problem. Can be caused by vacuum leak at inlet, or even a stuck EGR valve.
Also a plugged cat could cause P0300, but then you would see performance problems as well.
Crank sensor is also one to have a look at.
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