Same thing is happening with mine, John, and I have an extended warranty and the insurance company and repair shops will not help me as they say that my engine is blown and it is due to "owner neglect". I resent this accusation because I do everything by the book and have maintained the mower well over these 4 seaons and I blame Toro for a lemon of a lawn mower. Have you received any assistance with your problem? Tom in Chicago.