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Re: Knock Sensor

> I replaced my knock sensor a while ago. (89 200T) The agents tell me
> that the knock sensor is a quartz device which produces a voltage when
> sensing knock. I have seen ceramics do that?  IMHO the impedance should
> not make much of a difference.

Someone suggested that the knock sensor was basically a microphone.
After looking at the schematic in the Bentley, I must concur. Looks
like a condensor microphone.

> Any idea what voltage is generated?

No, can't say as I do. But I think I'll chance it this weekend and 
remove it and try to fix the breaks. Weather permitting.

-doug q
-Douglas Hurst Quebbeman (dougq@iglou.com)            [Call me "Doug"]
    QuattroClub USA# 4536              Audi International # 100024
       74 100LS Auto, 77 100LS Auto, 84 Coupe GT, 86 5Kcstq   
"The large print giveth, and the small print taketh away."  -Tom Waits