Question about 2003 Dodge Durango

1 Answer

Hello, I have a 2003 Dodge Durango,4.7 engine Off and on when I punch it to pass, it gets to about 3000 rpms and then bogs down as if the timing is not advancing. Transmission kicks down ok. Check engine light flashes two or three times and goes off, leaving no codes. This is off and on, hot or cold. Temperature come up a little also on the highway. Starts fine, idles smooth eather way, accelerates slowly to about 65 MPH I see it has a crank sensor, and a cam sensor, which is responsible for advancing the timing? Help!!

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  • Alvin D. Easterday Jun 03, 2009

    Hello Localwander, It has 94500 miles, and an automatic. It leaves no codes that we can find. Like i said it's as if the timing it not advancing, like the older distributors with the timing way retarded! When this not happening it will run up as far as 5000 RPMs through the gears like new!

    Thanks

  • Alvin D. Easterday Jun 03, 2009

    Hello, again localwonder, while I am digesting your solution (there's alot to it) Could you tell me where the PCM is located, and I assume it can, but it can be replaced, right?

    I do know where the crank and cam sensors are, and were on my list anyway. Not that expensive even from Dodge. I do agree with you, there is no timing advance when the demand it put on it.

    Thank you for reminding of the fuel pump/ strainer, that was the first thing I changed.

    Thanks again

  • Alvin D. Easterday Jun 03, 2009

    Ok, I take it that the dealer would have to replace the PCM also? $$ Oh well It has to be done and done right to be dependable again.

    Thank you, I will check the other items you mentioned, some of that i can do my self.

    I appreciate you time on this. Thanks

  • Alvin D. Easterday Jun 03, 2009

    Thank you localwonder you explained this very well for me. I will check out your recommendations. I had a lot of people scratching there heads on this one.

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  • Master
  • 6,784 Answers

Ok, to be accurate with my solution, i will require the actual mileage that is on the vehicle.

Posted on Jun 03, 2009

  • 6 more comments 
  • Michael Masters
    Michael Masters Jun 03, 2009

    If you could post the actual mileage that is on this vehicle, that would be great.

  • Michael Masters
    Michael Masters Jun 03, 2009

    Ok, this engine is running a distributorless system that incorporates the following.


    Power train control module (PCM)


    Ignition coils


    Spark plug cables


    spark plugs


    Crankshaft and camshaft position sensors.


    I recommend changing the fuel pump and filter during this inspection. These symptoms you are experiencing are the result of bad ignition timing that is being caused by a defective PCM. The spark is being adjusted with no warrant. the two sensors are responsible for many of the signals that are feed to the PCM. You stated that you have no codes stored and, the light blinks on and off. this is the result of a faulty PCM. Although i do recommend inspecting all component above, this is most likely going to be a faulty PCM.


    The PCM automatically regulates the spark advance to fire the spark
    plugs according to input from various engine sensors. The input signals
    are then used to compute the optimum ignition timing for the lowest
    exhaust emissions and best driveability. During the crank-start period,
    ignition timing advance is set to ensure quick and efficient starting.
    The
    amount of electronic spark advance provided is determined by four input
    factors: coolant temperature, engine rpm, throttle position and
    available manifold vacuum. On some late model systems, intake manifold
    temperature is also used. Gear selection may also be a factor.

    Battery
    voltage is supplied to each coil by the Automatic Shutdown (ASD) relay.
    The PCM opens and closes each coil's ground circuit at a specific time
    to fire the plug.

    By controlling the coil ground circuit, the PCM
    is able to set the base timing and adjust the ignition timing advance.
    This is done to meet changing engine conditions.


    Base ignition timing is set by the PCM and is not adjustable.


    Concerning the Raising temperature during acceleration, this is the result of sludge build up in the radiator. i recommend flushing the radiator soon and, a total inspection of the water pump and thermostat asap.




  • Michael Masters
    Michael Masters Jun 03, 2009

    Since this engine has about 94,000 miles on it, i recommend a timing chain replacement if not done so recently. it is time for this replacement. this timing chain can stretch, causing the valves to jump timing as well. if you are hearing any rattling ore tapping, this can be a sign of bad valve timing.If you have replaced the timing chain, please disregard this warning.

  • Michael Masters
    Michael Masters Jun 03, 2009

    The Powertrain Control Module (PCM) is located in the engine compartment. The PCM is referred to as JTEC. It is replaceable.

  • Michael Masters
    Michael Masters Jun 03, 2009

    This is a dealer part and it will have to be programmed as well if replaced.

  • Michael Masters
    Michael Masters Jun 03, 2009

    The Engine coolant temperature sensor runs directly through this PCM as well. this could explain the rising temp gauge. i would still preform a flush on that radiator and, inspect the water pump and thermostat for faults just to be safe.

  • Michael Masters
    Michael Masters Jun 03, 2009

    Here is a diagram of the PCM. the number five arrow is pointing to the PCM.








  • Michael Masters
    Michael Masters Jun 03, 2009

    Ok, be sure to rate my solution and, god bless:)

    Have a great day:)


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