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Home >> Honda >> 1978 >> Civic Base, 2D Hatchback, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Ignition Timing Control - Civic >> Description >> Temperature/Transmission Controlled Spark
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Temperature/Transmission Controlled Spark

The 1974 models use a temperature/transmission controlled spark system. The 1975-76 manual transmission equipped models use a transmission controlled spark system. Both systems are designed to reduce oxides of nitrogen (NOx) emissions during normal engine operation. Systems consist of transmission sensor, coolant temperature sensor (1974 models only), and solenoid valve.

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