way to check tha knock ?

Denis sparkplugvw at hotmail.com
Mon Dec 13 19:41:12 EST 2004

  tap the sensor with an hammer ? hehehe

  ok i see , if i sing into it , can i record ?,,,, i m very tired to play i m only say st... things :-)


  finally i got it started ,,, i did when i shake the accelerator while cranking...
    ----- Original Message ----- 
    From: Kneale Brownson 
    To: Tony Lum ; Denis ; quattro at audifans.com 
    Sent: Monday, December 13, 2004 6:46 PM
    Subject: Re: way to check tha knock ?

    Aren't these sort of like a stretch bolt, in that once you torque the
    fastener, you cannot reuse the sensor?  Thought I read that here some time

    At 02:59 PM 12/13/2004 -0800, Tony Lum wrote:

    >The knock sensor is a piezo (crystal) microphone.  In other words 
    >vibrations distort crystal element which then generates a voltage.  IMHO, 
    >one way to check it is to use an oscilloscope (because piezo is high 
    >impedance) bolt the sensor to a block of metal and then tap the block with 
    >a hammer and observe if there's an output.  No BTDT, though and nobody's 
    >actually done it.

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