This is how I understand our ignition system works on starting the motor......this is not gospel, only my meager grasp of the event
The DIS needs the crank signal and the cam signal and a reference signal to be fully operational. Number 6 has to be at TDC exhaust so that the DIS (?) knows that 1 is on TDC compression. That's the end of my knowledge of the events that are needed. If the DIS breaks I wonder if the car just stops or is there a limp home mode programed in somewhere?
Now I don't know how it all fits together, but all that has to line up correctly in order for the motor to fire up. Oh, one other thing that is a result of the "guy in the loading lot blowing up our 90 cams"....they designed back in the delay in the programing so we get some oil up top at the cams before the motor lights off.
Sorry that's all I can bring to the dance. But, we were the first vette NOT to have a distributor!
No opti-spark for us!
