HEI timing jump

[bamcknig at postoffice.syspac.com]

The last I remember, i was going to the library and gar thought he 
might round up some info.  I still haven't been to the library.

I think that we determined that the 4 terminal was strictly a switch.
Also that there was probably about8 deg advance because of the way 
the reluctor built its magnetic field as the speed of the distributor 
increased.  No help to you with a crank- hall timing.
There are other modules.  5pin for sure and I think a seven pin.
The question is: Is there a control signal(that could be hacked)  
causing the change in timing, or is the change in timing coming from 
the computer.  I lean towards an intelligent module that can be 
hacked.  Some place I got the notion that extra pin(s) receiaved a 
signal derived from the knock sensor that changed the timeing.  The 
vacuum advance and mechanical advance were of course still in the 
loop.  Wheteher the signal was a short, open, change in resistance or 
voltage, I have no idea.  And remember, at this point in time I am 
just rcollecting.  The SHADOW knows| | and so doesGM.

Bob McKnight
Phx AZ