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.

Part Throttle Engine Detonation

EGR valve stuck closed. Leaky valve diaphragm, vacuum restricted to EGR valve, EGR disconnected. TVS and/or PVS not opening, load control valve venting, EGR passages blocked. Insufficient backpressure. EVP sensor "O" ring leaking or sensor loose (EEC).