How serious is the engine knocking sound issue?
2 Answers
The problem is very serious and requires immediate inspection at a repair facility. Below is an introduction to engine knocking: 1. Definition: Engine knocking is a phenomenon where a metallic knocking sound occurs when the pressure rise rate in the cylinder is too high. Knocking is categorized into combustion knocking and mechanical knocking. A sharp metallic knocking sound near the top dead center due to combustion reasons is called combustion knocking or hot knocking. A dull knocking or friction sound caused by abnormal clearances in moving parts and bearings is called mechanical knocking or cold knocking. 2. Causes: Poor lubrication conditions, low oil pressure or excessively low oil viscosity, inadequate splash lubrication on the cylinder walls, failure to form a normal oil film between the piston and cylinder wall, leading to direct contact between the piston and cylinder, resulting in knocking.
I've been in the auto repair industry for decades and have seen countless cases of engine knocking. That clicking or metallic sound is usually heard during acceleration or uphill driving, most commonly caused by detonation due to severe carbon buildup clogging cylinders, aging spark plugs, or using low-quality gasoline. In mild cases, the impact isn't major—just higher fuel consumption. But if left unchecked, piston rings and cylinder walls wear rapidly, potentially leading to bent connecting rods, with terrifying costs for engine replacement. I recommend getting it diagnosed at a professional repair shop at the first sign of knocking—don't skimp on minor issues. Regular use of high-octane fuel, quality spark plugs, and carbon cleaning can significantly reduce risks. Also, mind your driving habits—avoid frequent short trips that repeatedly start-stop the engine to prolong its lifespan. Bottom line: never ignore this problem; early intervention saves headaches.
