way to check tha knock ?
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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