What is the condition of accelerator knocking?

There is no throttle knock, this is engine knock. Engine knocking is a phenomenon that the engine makes a sharp and crisp impact sound when the car is accelerating, which is usually caused by too large ignition advance angle or low-grade gasoline (low octane number). Knocking is very harmful to the engine. The main hazards are: engine power decline, oil consumption increase, noise increase, vehicle comfort deterioration, emission deterioration and so on. Knock can be divided into induced knock and non-induced knock. Induced knocking usually leads to engine jitter, even obvious body jitter. Non-inductive knocking is mainly manifested by the increase of engine noise.