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1994 Dodge Ram 2500 Question: chatter or vibration 42 to 45 mph in od

 

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Visitor, 5.9L 6 Cylinder Diesel Turbo, Rio Rancho, NM, April 04, 2011, 15:26

when driving with no load

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  • Answer #1

    April 07, 2011, 12:05
     Master

    There is a Technical Service Bulletin to address a similar issue.
    NO: 21-04-95
    SUBJECT: Vibration or Perceived Engine Miss
    DATE: Apr. 14, 1995
    NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE CUMMINS DIESEL ENGINE AND AUTOMATIC TRANSMISSION.

    SYMPTOM/CONDITION:
    A vibration or perceived engine miss at approximately 1100 RPM as the torque converter clutch engages. This condition occurs in 4th gear at speeds between 42 to 48 MPH.

    DIAGNOSIS:
    After duplicating the above condition, verify the part number on the Powertrain Control Module (PCM). For proper repair procedure, refer to the guidelines given below.
    If the vehicle is a 1994 MY equipped with PCM P/N 56027303 or 56027304, replace the PCM with P/N 4798745. Proceed to the PCM replacement section of this TSB.
    If the vehicle is a 1995 MY, verify that it is equipped with PCM P/N 56028335 or 56028336, and proceed to the PCM reprogramming section of this TSB.
    If the vehicle is equipped with a PCM other than 56028335, 56028336, 04798745, or 04856080, replace the PCM with P/N 4798745 and proceed to the PCM replacement section of this TSB.

    NOTE: IF THE VEHICLE IS EQUIPPED WITH PCM P/N 4798745 OR 4856080, THE SOFTWARE UPDATE NEEDED TO ADDRESS THIS TSB ISSUE HAS ALREADY BEEN COMPLETED AND NO FURTHER ACTION IS REQUIRED.

    PARTS REQUIRED:
    Quantity
    Part No.
    Description

    (1) 04798745 Module, Powertrain Control (1994 Only)
    (1) 4669020 Label - Authorized Software Update
    (1) 4275086 Label - Authorized Modification

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