Dasher EGR System
The EGR temperature control valve prevents vacuum from reaching EGR valve when engine is cold. When engine reaches normal operating temperature, vacuum is supplied to EGR valve from throttle valve venturi of CIS injection system via a vacuum booster which amplifies this weak vacuum signal to a level which will operate the EGR valve. A vacuum modulator is used to ensure an adequate supply of manifold vacuum to vacuum booster. An EGR delay valve is incorporated on automatic transmission equipped models to delay EGR operation.