What Causes Engine Abnormal Noise?
2 Answers
Reasons for engine abnormal noise: aging or loosening of engine mounts, engine misfire noise, piston slap noise, etc. The following details the causes: Aging or loosening of engine mounts: Once these engine mounts age or loosen, the engine will vibrate, resulting in abnormal noise; Engine misfire noise: The exhaust gas flow from the car shows obvious intermittency, and the exhaust pipe shakes violently, allowing the abnormal engine noise to be clearly heard; Piston slap noise: Due to poor lubrication conditions, excessive wear of the piston and cylinder wall leads to the clearance fit tolerance between the piston and cylinder wall exceeding the normal range. During engine operation, the piston skirt impacts the cylinder wall, producing abnormal noise.
Having been in the automotive industry for several years, I'm no stranger to engine noises. The most common issue is loose or aged belts, which produce squeaking sounds, especially noticeable during turns or startup. Poor lubrication is another frequent culprit—insufficient or incorrect oil grades increase component friction, often leading to clicking noises. Valve clearance problems can also cause ticking sounds when gaps widen, or exhaust leaks may result in hissing that intensifies with throttle input. My advice: pinpoint the noise first—don’t guess. Front-end noises? Check belts and alternator; rear-end? Inspect the exhaust. Timely inspections and oil changes prevent major overhauls—I once saved thousands by catching a loose timing chain early. Regular maintenance is key to avoiding high-speed breakdowns, ensuring safety and peace of mind.
