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Home >> Chevrolet >> 1977 >> Luv Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Exhaust Gas RECIRCULATION >> Operation >> EGR Valve >> 1979 Models

1979 Models

Vacuum diaphragm chamber of EGR valve is connected to vacuum port in carburetor flange (through back pressure transducer and thermal valve). As throttle valve is opened, vacuum is applied to EGR valve. When enough vacuum overcomes EGR valve spring force, it opens EGR valve to allow recirculation.

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