What is knocking and pinking?

Knocking and pinking, often referred to as "knock" or "ping," are terms used to describe abnormal combustion in an internal combustion engine. Knocking occurs when fuel-air mixture ignites prematurely in the cylinder, leading to a knocking sound and potential engine damage. Pinking specifically refers to a similar phenomenon where the combustion produces a sharper, more pronounced sound, typically associated with higher octane fuel requirements not being met. Both issues can reduce engine efficiency and longevity if not addressed.