EGR Valve
When no vacuum is applied to EGR valve, it is held closed by spring pressure. When vacuum is applied to upper chamber, valve opens half-way. With vacuum applied to both chambers, EGR valve is fully opened.
When no vacuum is applied to EGR valve, it is held closed by spring pressure. When vacuum is applied to upper chamber, valve opens half-way. With vacuum applied to both chambers, EGR valve is fully opened.