1.6L Engines
When intake manifold temperature is 59-95°F (15-35°C), thermo vacuum valve I opens distributor lines to atmosphere. No advance is applied.
When engine is operating above or below these temperatures, vacuum is applied through check valve and obtained at a below-throttle vacuum port (with engine idling) or applied through orifice and obtained at an above-throttle vacuum port (engine above idle). See Fig 1 .