What are the causes of engine knocking?

[DeJude]

The causes of engine knocking are: 1. Carbon deposits in the combustion chamber; 2. Using gasoline with an octane rating that is too low; 3. Poor quality gasoline; 4. Incorrect ignition timing. Symptoms of knocking: 1. Knocking creates sudden shock waves inside the cylinder that impact in all directions, causing strong vibrations in the engine's pistons, cylinder walls, connecting rods, crankshaft, etc., resulting in irregular metal knocking sounds; 2. Overheating of the cooling system; 3. Incomplete fuel combustion, with black smoke in the exhaust. Solutions: 1. Reduce the ignition timing advance; 2. Use gasoline with the specified octane rating; 3. Remove carbon deposits from the combustion chamber; 4. If knocking occurs when the car is going uphill, promptly shift to a lower gear; 5. Do not shift into a forward gear too early when starting the car.