1976-77 Dual Pick-Up Distributor Models

With engine cranking, the start pick-up coil will signal the ignition control module to provide additional spark advance during cranking. When engine starts, the run pick-up coil takes over. If coolant temperature is over 150°F, the computer creates additional spark advance for 1 minute, then gradually diminishes.

If coolant temperature is below 150°F, the temperature signal will cause the computer to prevent any spark advance which might be created by the vacuum transducer signal.

After reaching operating temperature, normal system operation will begin. The computer will use all sensor signals to provide an infinite variation of spark advance for all engine running conditions.

If the computer should fail, the system will switch to the "limp-in" mode. This will enable the engine to continue running, but poor performance will be experienced. Should the start pick-up coil or ignition control module fail, the engine will not start.