EGR Control Solenoid: Description and Operation

1984-87
The EGR solenoid is energized by the logic module when engine temperature is below 70° F. This closes the solenoid and prevents ported vacuum from reaching the EGR valve. When engine temperature exceeds 70° F, the solenoid is de-energized and ported vacuum from the throttle body will pass through to the EGR valve. At idle and wide open throttle the solenoid is energized, preventing EGR operation.