Knock alarm

[Frederic Breitwieser]

>the line that goes to the ECM to monitor for knock?
>Maybe someone can point out why this wouldn't work-  I haven't really
tried it
>myself... yet...

The input on the ECM as well as the knock sensor are very high impedence,
therefore putting two ECMs in parallel shouldn't be a problem - unless the
ECM provides a voltage to power the knock sensor through the input line.
I'm guessing this *might* be the case, since piezo microphones, which a
knock sensor basically is, can require power, ground in order to provide an
output.  I would imagine its a matter of attaching an ocilloscope and
seeing where the baseline voltage is recorded at.


Frederic Breitwieser
Homebrew Automotive
Bridgeport, CT 06606

Portable Web-Site: http://www.geocities.com/MotorCity/Downs/4605/index.html

Vehicles:
   1989 AG Hummer 4-Door
   1993 Supercharged Lincoln Continental
   2000 Mid-Engine Sports Car <smile>

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