What are the causes of engine shaking and abnormal noises?
1 Answers
The causes of abnormal noises during engine shaking include poor sealing of individual engine valves, excessively rich air-fuel mixture, leakage in high-voltage wires or spark plugs, etc. Poor sealing of individual engine valves: When there is poor sealing or burning of individual valves, severe air leakage due to poor valve sealing, insufficient or zero clearance in individual valves, carbon buildup between valve seats and valves, or vacuum tube detachment in some power-assisted vehicles, the engine will exhibit idle shaking, produce abnormal noises, and the noises will disappear when the engine speed is increased, with operation becoming smoother. Excessively rich air-fuel mixture: If the engine's air-fuel mixture is too rich, issues such as cylinder misfire, individual water jacket and cylinder penetration, individual intake valve water ingress, loose piston ring sealing, ring alignment seizure, piston top separation, excessive intake valve clearance, broken valve springs, lock piece detachment, or adjustment wire detachment may occur. The engine will produce rhythmic abnormal noises at various speeds, accompanied by severe shaking and difficulty in acceleration. Leakage in high-voltage wires or spark plugs: When there is leakage in the engine's high-voltage wires or spark plugs, issues such as overly soft distributor breaker contacts, loose contact rivets, loose fixed brackets, excessively large or small valve clearance, faulty or poorly connected capacitors may arise. This leads to good low-speed engine operation, but shaking and irregular noises at medium speeds.
