[Gmecm] V6-60 DIS spark retard advice?

[Mike V]

At 12:26 PM 5/23/2006 -0700, you wrote:

>Hello folks, I've got a 3.4 run by a '7730 ECM, with
>the DIS from a 2.8.  I could easily drive all the time
>with no preignition, but it is not too hard to force
>mild preignition (high load, high throttle, low to
>medium RPMs). I do have a knock sensor, and no codes
>are coming up for that, so I have some questions:
>
>1.  I have no VSS yet.  Does spark retard require VSS?

Hi Duncan,
I'm aware of RPM thresholds before KR occurs, but
not MPH thresholds.
Can you connect a scan tool to this engine?
It would tell you a lot more than a timing light.
MV