mikec26

Just changed PCV although old one moved freely. MIL light came back as the way it was. I deleted the code through my OBD2, and MIL was not illuminated at low rpm idle any more. It just blink blink whenever I started driving it or rev the engine over 1500rpm. It will just disappear when it back to 1000rpm idle. Any thought on this?

Thanks all for the inputs. This really exhausted all my energy. I think I will take it to the dodge house for a diagnosis. Just went through the service manual. It specifically indicated the PCV is due to inspection at this age and milleage. Actually mine is a bit overdue. Although I think PCV should cause random misfire other than single cylinder. With the PCV location is closed to cylinder 1 on the left. I think I will go ahead and replace it before taking it in. Overall it is not a expensive part and not that hard to do on the Journey.

My mechanic suggested a compression test is no need since the engine sounds normal and no misfire to him. Just the code P0301 kept popping up. I think I should get the compression test done to make sure. Does any one here know if there is any TSB or known issue with cylinder one on early generation of the Journey? And I also found this in the forum which was in a very similar situation as mine. His resolution was o ring replaced and PCM relearn. My oil pressure test result was fine. I remove the relay just to reset the PCM last night since the battery is hard to reach, but the MIL came back. Now MIL blinked blinked whenever engine went over 1000rpm if I was driving, but it return to steady below 1000rpm. It remain constanly illuminated if I pushed to 3000rpm at idle. No blinking.

All 4 of them were actually replaced at the dealer last time, so I assume they should use OEM parts.

All plugs were actually replaced 1.5 years ago, and only add 25000km on it so far. They were inspected and all good. Switching plug between 1 to 2 cylinder or 1 to 4. Still getting p0301

Ok Ladies and gentlemen. My 2010 2.4L has 140000 km so far, not too many issues other than plugs until now. Engine just stalled at a downshift last week. Luckily I was able to manage to restart the car and pulled it over. Engine is working very rough and Mil was flashing. I looked up scanner and got a bunch of codes for the crank sensor and misfire on cylinder 1. ( P0300 P0301 P0315 P0335 P0339 U0402). We went ahead and changed the crankshaft sensor since p315 p335 p339 were all refered to it. The Journey was started and idled fine, test drive everything felt normal just a bit weak. All code were gone except P0301 which is cylinder 1 misfire is on all the time. I have changed all plugs at 110000km. They were all fine. We swap coils, plugs. no change. Swapped fuil injectors, no change. Still just p0301. We got fuel pressure test done. Everything is normal. Do you guys think one of the cam sensors might be bad and could possibly be sending funky signals to pcm? Or the PCM need to be relearned after crank But there is no code for cam sensors at all and all code for crank sensor were gone. Welcome some expert insight here. Thank you all in advance for your idea.