Description

Fig. 38 Spark plug switching control system.:

This system, Fig. 38, is designed to change the ignition system from 2-plug ignition to 1-plug ignition during heavy load driving conditions in order to reduce engine noise. This system also functions to advance ignition timing by a specified value during 1-plug ignition.
This system is composed of an ignition control unit, which is installed in distributor and has a switching function which allows it to change from 2-plug ignition to 1-plug ignition, and a vacuum switch which senses the intake manifold vacuum. Neutral and clutch switches are also used as auxiliary control devices.