Lack of control of the environment is often pinpointed as a cause of frustration and stress in confined animals. When the animal cannot control things, such as the feeding time or the lighting program, and when it cannot escape from things it finds unpleasant, it often behaves in a manner that indicates frustration.
Cavitation can also cause excessive pump vibration, which could damage pump bearings, wearing rings, and seals. A small number of centrifugal pumps are designed to operate under conditions where cavitation is unavoidable.
Here is a list of the most common causes for pinging starting with the most popular ones. 1  Fuel octane rating too low. 2  Compression too high. (usually caused by carbon build up inside the combustion chambers) 3  Over heating of the engine or just an individual cylinder. (Hot spots)  Knock detector faulty.