Ignition Coils

[Neville Newman]

>     The Olds Quad 4 has had plug mounted coils for several years.  They are 
>     easy to get at any GM dealership.  Don't know if they're cheaper than 
>     the import (Bosch?) version.

This was not true of any of the Quad-4 or Quad-OHC engines i opened up
when i was doing diagnostic equipment development from '91-'94.  They
are distributorless, not direct.  They use the equivalent of a high-voltage
circuit board to route power from the coils to the plugs, rather than
wires.  They also were waste-spark systems, with only 2 coils to run
all 4 cylinders.