Re: Knock Sensor Question

["Bruce Plecan" <nacelp@bright.net>]

Interesting, I just happen to have a new SY KS here, and measeured it's
resistance and it was 100K.  Tapping on it one time got 160ish K.  Couple
minutes later no change.  Then tried AC, and tapping on it caused it to
flicker to like 20 mv...  The above was with a Radio Shack 805.
  Using a Tenma 72-6697, the voltage flickered slightly, but the resistance
swung to 170K ish
Just a FWIW.
Knoe your meter, good Karma
Grumpy

> Got a bit of experience w/ knock sensors tracking down my problem awhile
> back on my Syclone.  The Sy KS has an internal resistor around 4k, that
> allows the ECU to 'see' if its ok, open or shorted.  Other GM sensors do
> not have this inbuilt resistor.  The one (non-Sy) I have measures around
> 99k ohms (I'm checking this right now) - if rapped on w/ a screwdriver,
the
> resistance reading will go over 140k - probably a lot more sensitive than
> trying to measure AC voltage on it. I could get around .4v AC on a digital
> meter, but the change in the resistance was much easier to see.  If your
> resistance is either near zero or *very* high, I'd say the KS is toast.
>
> I was getting the false knock right @ 2000rpms; moved the KS (temporarily)
> to the front of the engine, as the 2000rpm knocks shown by the stock
> location sensor are gradually fading away as the new cam and/or
distributor
> wears in.  Soon's they're all gone, I'll reconnect the sensor in the stock
> location.  Thanks to all who helped me w/ this a few months back.
>
> Barry
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