GM Optispark

[Bruce Plecan]

Subject: Re: GM Optispark


>There's a hi-res and a low-res signal that comes from the Optispark.  The
>Opti is driven off the cam and there's 4 pulses per crank revolution
>(low-res) and 180 pulses per crank rev (hi-res).
>
>> Anu one know of an on-line picture of this set up, "wheel" sensor,
>> or what ever they got in there for crank posistion.
>
>http://www.charm.net/~mchaney/optisprk/optisprk.htm
>
>The 96/97 cars have a seperate crank position sensor on the crank itself
>for measuring crank velocity (for OBD-II misfire detection).  One neat
>thing is that the PCM can detect timing chain wear/slack by comparing the
>the crank position sensor to data from the Optispark. 
>-Jody

THANKS
Bruce