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1.6L, 1.7L & 2.2L 4-Cylinder

As the throttle blade opens, a slot type port in the carburetor throttle body is exposed to an increasing percentage of manifold vacuum. This port is connected through an external nipple directly to the EGR valve.

The flow rate is defendant on manifold vacuum, throttle position and exhaust gas back-pressure.

Fig 1: Ported Vacuum Control EGR System (1.6L, 1.7L & 2.2L 4-Cylinder Engines)