October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

EGR System: Notes

Various engine operating conditions are monitored to determine when EGR operation is necessary. When the EGR valve receives a vacuum signal, the EGR valve opens and meters gases from exhaust manifold into the intake manifold. Vacuum signals are determined by different system components depending upon engine size and vehicle model.