What Causes a Sudden Increase in Engine Noise?
2 Answers
Reasons for a sudden increase in car engine noise include excessive carbon buildup in the engine, aging engine mounts, and abnormal operation of engine cylinders. Excessive Carbon Buildup: The cause is too much carbon buildup inside the engine or the use of substandard fuel. Therefore, it is necessary to clean the carbon deposits promptly and switch to the correct fuel grade. Aging Engine Mounts: Engine mounts are rubber blocks between the engine and the frame, designed to reduce vibrations generated during engine operation and provide cushioning. Over time, engine mounts may age or loosen, leading to increased engine noise. When engine mounts show signs of aging or loosening, they should be replaced promptly. Abnormal Operation of Engine Cylinders: If one or more cylinders in the engine are not functioning properly, it can also result in increased engine noise. Abnormal operation of engine cylinders is often manifested by severe shaking of the exhaust pipe, requiring immediate inspection and repair.
As an experienced auto mechanic, I've seen this situation too many times. Sudden engine noise increase could indicate a loose or worn belt, with squeaking being the most common symptom; an exhaust pipe leak can cause a puffing sound due to poor exhaust flow; insufficient or degraded engine oil increases friction, resulting in a rumbling noise; a clogged air filter may cause airflow issues that amplify noise; and fan or water pump failures often produce a stuttering-like sound. When encountering such issues, don't delay – safety first: pull over to check the dipstick and belt condition. If you spot oil leaks or smoke, shut off the engine immediately and wait for assistance. Regular maintenance like oil changes and filter cleaning prevents many noise problems. Ignoring them only accelerates engine wear and doubles repair costs.
