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Home >> GMC >> 1975 >> Forward Control 7.4L Eng VIN Z, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Transmission Controlled Spark System >> Operation >> Idle Stop Solenoid

Idle Stop Solenoid

Idle stop solenoid is a 2-position electrically operated solenoid with an adjustable plunger. When energized, solenoid plunger contacts carburetor throttle plates and holds idle speed at specification. When de-energized, solenoid plunger allows throttle plates to close beyond normal idle position, shutting off air supply so engine will shut down without dieseling.