engine will not rev over 4000rpm

Discussion in 'Dodge Avenger Knowledge Base' started by garry w griffin, Oct 5, 2017.

  1. garry w griffin

    garry w griffin New Member

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    Had check engine code of PO305 on a 2009 avenger with 2.4l engine. unsure why because that is for a random misfire in cylinder 5. car only has 4 cylinders. Car started fine. while idling I felt a little stutter. started driving home and check engine light came on, blinking and beeping. Pulled over, shut car off and checked code. Erased code and started for home again. Had no power. engine stalled out at stop sign. got it home. Changed out coil packs and plugs. Idles great. when I start to drive, the check engine light comes on within one minute. Checked code, random misfire. Cleared code and started car. idled fine for over 20 minutes. Revved engine but would only go to 4000rpm.
    Anyone have any ideas?
     
  2. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    Just for the heck of it....
    Two odd thoughts
    (1) Did you just recently get fuel?
    (2) When you changed the plugs were the Plug connectors or plugs wet with oil?
     
  3. garry w griffin

    garry w griffin New Member

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    this started after burning half tank of Sunoco 87 octane.
    Plugs are clean with only 17,000 miles on them
     
  4. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    So no oil was in the spark plug wells, How many miles are on your ride?

    BTW ..Welcome to the Forumz!

    EDIT: Are you sure of the initial code of P0305? A P0315 would be a crank position sensor problem
     
  5. garry w griffin

    garry w griffin New Member

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    thanks for the welcome! Yes, initial code was a PO305. Did get a PO315 but after resetting have not seen that code again. Just keep getting a PO300, random misfire. Thinking of changing the CPS as the car has 186,500 miles on it
     
  6. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    At that mileage and because they are NOT that expensive, I would recommend replace that and the camshaft position sensor. Then see how it goes, May have to drive cycle it to see what it does not just parked rev it.
     
  7. garry w griffin

    garry w griffin New Member

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    already on my to do list for the morning. thanks for the info. Will post if it had any effect or not.
     
  8. garry w griffin

    garry w griffin New Member

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  9. garry w griffin

    garry w griffin New Member

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    Alright guys, changed out the three sensors, crankcase and camshaft sensor, Car idled normally, Put in gear, got about 200 yards before the light came on, same code, PO300, random misfire. Checked the PCV and it shook loudly. Car still will not rev over 4000RPM. thinking maybe a fuel pressure problem? Vacuum leak?
    If I had hair, I would be pulling it out right now!!!!!!!!
    Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  10. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    If you have done all spark related checks and at your stated mileage, I have a nagging suspicion of a worn timing chain. Old school check would be to check for slack movement at the crank pulley. If not more than 10* movement then I would go to a fuel delivery problem. Motor makes no unusual sounds does it?
     
  11. garry w griffin

    garry w griffin New Member

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    no unusual sounds at all. gonna check fuel pressure when I figure out how to do it. bought the six volume Service Manual on EBAY this weekend. Waiting for delivery
     
  12. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    Other than the injectors, you will find that the fuel pressure regulator and all is part of the fuel pump assembly mounted in the fuel tank.Easy to get to,just pop the rear seat bottom out and remove the cover plate on the floor pan. If getting parts for yours, make sure of which model motor you have..normal or PZEV. Fuel system parts ARE different along with the spark plugs.
     

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