Spark Plug Switching Control

The spark plug switching system is designed to change ignition system firing from 2 spark plugs to one spark plug. This takes place during heavy load driving conditions to reduce engine noise. When coolant temperature is greater than a predetermined amount and engine is cranking or under a light load, a 2 spark plug ignition system is in effect. If coolant temperature is greater than a predetermined amount and the engine is operating under a heavy load, the ignition system is switched to a one spark plug type ignition system. When coolant temperature is less than a certain preset temperature, no matter what engine operating conditions take place, a 2 spark plug system is in effect.