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