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myoung1018
myoung1018 3/9/2013
1996 Dodge Grand Caravan SE 6Cyl3.0L - Engine
Runs ok when cold but after 6 to 7 mins engine misfires at idle and under load. When i come to a stop it stalls
has 228,000.Have changed spark plugs and wires and checked cap and roter also checked engine compression( avg 150 psi per cylinder) NOTE AFTER I COME TO A STOP AND IT STALLS WHEN I RESTART THE ENGINE IT IDLES GREAT WITH NO MISS BUT AS SOON AS I PUSH ON THE ACCELERATOR THE MISFIRE STARTS AGAIN.
1 Answer
  • CVO
    CVO 3/9/2013
    The check engine light doesn't have to be ON to store a fault code.

    Check the vehicle for fault codes to see if there are any sensors were involved to the malfunction of the engine.

    1.Local auto parts stores such as Autozone ( not in California) or Advance Auto parts will scan and retrieve any diagnostic trouble codes ( dtc ) stored in the powertrain control module for free of charge..

    2. Amazon.com has the code reader for less than $24.00 dollars.

    3.Re-post the dtc's in here " answer question " for further assistance.

    Note: we need the dtc's to identify the sensor, there are a dozen different sensors to operate the car.

    Visit this site and see all the different sensors.

    http://www.freeautomechanic.com/car-engine-sensors.html

    Navigate to this site and see the code reader

    http://www.amazon.com/.../...imh_gw_p263_d0_i1

    Note: it may be the manifold absolute sensor ?

    The PCM supplies 5 volts of direct current to the Manifold Absolute Pressure (MAP) sensor. The MAP sensor then converts the intake manifold pressure into voltage. The PCM monitors the MAP sensor output voltage. As vacuum increases, the MAP sensor voltage decreases proportionately. Also, as vacuum decreases, the MAP sensor voltage increases proportionally.

    With the ignition key ON , before the engine is started, the PCM determines atmospheric air pressure from the MAP sensor voltage. While the engine operates, the PCM figures out intake manifold pressure from the MAP sensor voltage. Based on the MAP sensor voltage and inputs from other sensors, the PCM adjusts spark advance and the air/fuel ratio. The MAP sensor is mounted to the intake manifold, near the throttle body inlet to the manifold. The sensor connects electrically to the PCM.

    1.Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion.
    2.Test the MAP sensor output voltage at the sensor connector between terminals A and B (3.0L engine).
    With the connector clip on the bottom, from left to right ( A, B, C. )
    3.With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts. The voltage should fall to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to the next step. If not OK, go to Step 5.
    4.Test the PCM terminal 36 for the same voltage described in the previous step to make sure the wire harness is OK. Repair as necessary.
    5.Test the MAP sensor ground circuit at the sensor connector terminal A (2.4L, 3.3L and 3.8L engines) or C (3.0L engine) and PCM terminal 43. If OK, go to the next step. If not OK, repair as necessary.
    6. Test the MAP sensor supply voltage between the sensor connector terminals A and B (2.4L, 3.3L and 3.8L engines) r A and C (3.0L engine) with the ignition key in the ON position. The voltage should be about 4.5-5.5 volts.
    7. There should also be 4.5-5.5 volts at terminal 61 of the PCM. If OK, replace the MAP sensor.
    8. If not, repair or replace the wire harness as required.
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