DELCO-REMY Electronic Spark Selection: Operation

The distributor pick-up coil signal is sent to the electronic decoder to provide engine speed and ignition timing information. The decoder signal is then sent to the fifth pin of the distributor 5-pin module, signalling either delay or non-delay in shutting off the current to the primary winding of the ignition coil. Maximum delay of primary winding current shutoff occurs when engine is cranking or during cold engine operation (California models only). This is also the point of maximum spark retard from normal timing.