Electronic EGR Valve System
The Electronic EGR Valve System is controlled by the ECA. An EGR Valve Position sensor (EVP) mounted on top of the EGR valve sends an electrical signal to the ECA indicating the position of EGR pintle. See Fig 1 . Based on this information and engine requirements, the ECA sends an electrical signal to the Electronic Vacuum Regulator (EVR) to control vacuum to the EGR valve. On the 4.9L, the ECA signals the dual EGR Solenoid Vacuum Valves to control vacuum for EGR valve operation.
As vacuum is applied to the EGR valve, the diaphragm is actuated, lifting the pintle, allowing exhaust gas to flow through EGR valve into intake manifold. The amount of exhaust gas flowing through the EGR is proportional to the pintle position. This position is then signaled to the ECA.