Spark Combustion Computer

On Calif, vehicles and Federal 318" 4-barrel V8 engines, a spark combustion computer is used. This computer not only has a 10 pin dual connector, but also a 6 pin single connector (3 pins blank on 4-cylinder, 2 pins blank on others). The combustion computer controls ignition system and air/fuel ratio of carburetor.

Electronic Spark Advance system is new in 1980, determining spark advance by speed and vacuum only. Start timer, vacuum transducer count-up clock and memory, throttle transducer, and ambient air temperature sensor features used on previous models are not used in 1980.