An engine knock results from one of several problems such as a loose connecting-rod bearing, bad fuel mixture, worn spark plugs or carbon build up inside the cylinder walls. A vehicle experiencing a knock should be quickly inspected to avoid any serious damage to the internal components of the engine.Continue Reading
Engine knock sounds vary depending on the cause, as it can be either a deep thumping noise or a light rattle. The root of the engine knock can generally be solved by locating the source of the sound. There are a number of root causes to many common engine problems.