4.0L Engine
WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) controls the EGR vacuum regulator solenoid. The EGR vacuum regulator solenoid controls the vacuum to the EGR valve. When the EGR valve opens, exhaust gas flows to the intake manifold to be returned to the combustion cycle. The differential pressure feedback EGR system monitors the flow and returns a signal to the powertrain control module (PCM).
The amount of recirculated exhaust gas depends upon:
- Engine RPM.
- Intake manifold vacuum.
- Exhaust backpressure.
- Engine coolant temperature.
- Throttle position.