Loud CLUNK on accelerating from stop

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Hoosier Prius driver, May 17, 2021.

  1. Hoosier Prius driver

    Joined:
    May 17, 2021
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    Location:
    Indiana
    Vehicle:
    2011 Prius
    Model:
    Three
    My 2011 Prius occasionally clunks loudly when starting from a complete stop. It feels as though something is stuck and then releases the second I step on the gas pedal, and I think the sound is coming from the rear of the car. It doesn't matter how long or short my stop is at an intersection, and there's no rhyme or reason as to when the CLUNK happens. These are definitely not hard accelerations, either.

    I notice this issue when the car is being driven a long distance. It never happens on short trips.

    Any ideas as to what might be going on?

    For what it's worth, I have the car regularly serviced by my local dealer, but last year it look a lot of time and money for its service department to figure out that a "whump whump" sound was being caused by an unevenly worn tire, even though the tires were regularly rotated. (They replaced brakes and rotors first.)

    Thanks for any help!
     
  2. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
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    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    bad engine mount.
     
  3. Mendel Leisk

    Mendel Leisk Sand Pounder

    Joined:
    Oct 17, 2010
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    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    If possible, raise the rear (chock front wheels), apply/release the parking brake a few times, and check if the rear wheels spin semi-freely.
     
  4. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
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    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    My thought was something sticking with one of the rear brakes.
    OR a bowling ball in the trunk. :)
     
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