Camaro Z28 V8-305 5.0L VIN F FI (1991)
EGR Control Solenoid: Description and Operation
Computer Command Control - Port Fuel Injection
EGR Control Solenoid
The Exhaust Gas Recirculation (EGR) vacuum control has a vacuum control solenoid that uses "Pulse Width Modulation" (PWM). This means that the
ECM turns the solenoid "OFF" and "ON" many times a second and varies the amount of "ON" time (pulse width) to vary the amount ported manifold
vacuum to the EGR valve.
