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Home >> Toyota >> 1979 >> Land Cruiser 4D Utility >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Spark Control/Delay Systems >> Operation >> Spark Delay System
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Spark Delay System

When engine coolant temperature is below 95°F (35°C), the Thermostatic Vacuum Transmitting Valve (TVTV) is open and normal vacuum advance is allowed. When coolant temperature rises to 140°F (60°C), the TVTV closes, forcing vacuum to flow through spark delay valve. Vacuum must flow through a small orifice in valve, delaying time when full vacuum advance will occur. When intake manifold vacuum drops, check valve opens, allowing vacuum advance to release immediately.

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