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Knocking

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by wishg3, Nov 8, 2007.

  1. wishg3

    wishg3 New Member

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    I'm hearing a short series of knocks during the start up process. About 2 or 3 at a time. Then it stops.
     
    #1 wishg3, Nov 8, 2007
  2. qbee42

    qbee42 My other car is a boat

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    Can you be more specific? Are the knocks pinging as you might get from low octane gas, or are you talking about a mechanical noise, such as the brake accumulator pump?

    Tom
     
    #2 qbee42, Nov 8, 2007
  3. paprius4030

    paprius4030 My first Prius

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    Are you talking about the clicking when you push the button to power up?
     
    #3 paprius4030, Nov 8, 2007
  4. galaxee

    galaxee mostly benevolent

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    relay clicking?
     
    #4 galaxee, Nov 8, 2007
  5. wishg3

    wishg3 New Member

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    <div class='quotetop'>QUOTE(qbee42 @ Nov 8 2007, 07:16 PM) [snapback]536966[/snapback]</div>
    It seems to be mechanical. It happens when I go from neutral into drive or reverse.
     
    #5 wishg3, Nov 16, 2007
  6. qbee42

    qbee42 My other car is a boat

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    <div class='quotetop'>QUOTE(George W. @ Nov 16 2007, 01:53 PM) [snapback]540666[/snapback]</div>
    You are sure it's not the brake accumulator pump? It runs for a couple of seconds when you press on the brake pedal. It makes a rattling sort of sound. It doesn't go every time you brake, but maybe about every third time. The sound appears to come from the driver's foot well. The reason I am thinking brake accumulator is that you mention shifting into D or R. When you are doing that, you have usually pressed the brake.

    Tom
     
    #6 qbee42, Nov 16, 2007
  7. wishg3

    wishg3 New Member

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    <div class='quotetop'>QUOTE(qbee42 @ Nov 16 2007, 08:57 PM) [snapback]540769[/snapback]</div>
    That sounds like the answer to my question. Thank you. George
     
    #7 wishg3, Nov 17, 2007
  8. Tideland Prius

    Tideland Prius Moderator of the North
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    <div class='quotetop'>QUOTE(George W. @ Nov 16 2007, 10:53 AM) [snapback]540666[/snapback]</div>
    Ohh... that might be the PSD engaging. Remember that the shifter is by-wire so it's just a computer chip telling another computer chip to move something mechanical.

    You can also hear a click when you "shift" in and out of P. You can hear the ratchet engaging/disengaging. OF course you'll need the radio to be off.

    Btw, I've moved it to the Care, Maintenance and Troubleshotting forum with a link from the Eastern Penn forum so people can find it.
     
    #8 Tideland Prius, Nov 17, 2007
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