Electronic EGR Valve
This valve is operated by a vacuum signal from one of the dual EGR solenoid valves or the electronic vacuum regulator which actuates the diaphragm. As vacuum overcomes the closing spring pressure, the diaphragm is actuated lifting the pintle off its seat and exhaust gas begins to flow. Flow is proportional to pintle position. The EVP sensor on the valve sends an electrical signal relevant to valve position to the Electronic Control Assembly. See Figure .
The electronic EGR valve assembly is not serviceable. EVP sensor and EGR valve must be serviced separately. The EVP sensor mounted on top of this valve sends out electrical signals to the Electronic Control Assembly (ECA) that indicate how far the EGR valve is open.
The ECA then signals the EGR control solenoids to maintain or alter EGR flow as required. Source vacuum is obtained from the intake manifold and is bled off or applied to the EGR diaphragm by the ECA. A cooler is sometimes used to reduce gas temperatures and detonation and allow better gas flow. This valve operates only at part throttle mode. It is closed in all other modes.