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Rattling no one can diagnose!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by VickiHB, May 21, 2020.

  1. VickiHB

    VickiHB New Member

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    I have a 2012 Prius with 298,000 miles (I know, right?!) I hear a rattle on take off at low speeds of 5 miles per hour, have had the exhaust system repaired as well as checked out by multiple other mechanics. It’s esp bad when hot and I feel like it’s going to stall but it hasn’t. Anyone know what’s up? Rattle has been present for years !
     
    #1 VickiHB, May 21, 2020
  2. tankyuong

    tankyuong Senior Member

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    Egr circuit needs cleaning
     
    #2 tankyuong, May 21, 2020
    pjksr02 and Grit like this.
  3. Grit

    Grit Senior Member

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    There’s no info rattling, as far as we don’t know, it can be an aero panel loose.
     
    #3 Grit, May 21, 2020
    pjksr02 likes this.
  4. 2012 Prius v wagon 3

    2012 Prius v wagon 3 Active Member

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    To help start narrowing it down ... does it happen in EV mode, or only when the engine is running? Reverse as well as forward? Confirming your description - takeoff meaning that while the car is sitting there with the engine idling there is no noise, and then when you start to drive away the noise happens? No noise when revving the engine while stopped?

    But to lower your expectations, if you've had mechanics inspect your car and fail to find this, it might be tough for us to do it based on a written description. I bet any of us would come up with better guesses if we had the car in front of us.
     
    #4 2012 Prius v wagon 3, May 21, 2020
  5. The Electric Me

    The Electric Me Go Speed Go!

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    Yes, very hard to diagnose this over the internet.
    Why do you feel it's going to stall?
    How much of this "stall" feeling is connected to the rattle?

    Not sure even with these answers I could offer much.
    Best bet, would be to have your mechanic/techniciian ride in the vehicle and duplicate exactly what is happening, when it is happening.
     
    #5 The Electric Me, May 21, 2020
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