What causes abnormal noises in a car?
3 Answers
Car rattling noise reasons are as follows: 1. Reason one: When the car is cold started, the engine sound will be slightly louder than when the engine is warm. As long as the sound is uniform and soft, not harsh, it is generally not a problem. This is because when the engine is cold, the gap between the cylinder wall and the piston has not reached the optimal size, and the lubrication of the engine oil is not sufficient. Usually, when the engine block temperature reaches about 95 degrees, the sound will return to normal. 2. Reason two: Engine oil issues. Poor-quality engine oil, not changing the oil for a long time, or lack of engine oil can easily increase the friction between the valves and the guides, as well as the hydraulic lifters, making various sounds in the engine louder.
Having driven for so many years, I've frequently encountered rattling issues and have summarized quite a bit of experience. The most common is the clunking or rattling sound from the chassis when going over bumpy roads, which is likely due to loose shock absorbers or suspension links that need tightening or replacement. If there's a squeaking sound when turning, it's mostly due to worn suspension ball joints or lack of lubrication. Another common issue is the squealing sound from worn brake pads—once you hear that sharp squeal when braking, it's the wear indicator reminding you to replace the pads soon. A ticking sound at idle? It could be a loose engine belt or a faulty water pump. Interior noises like rattles near the storage compartment are often caused by an unlatched glove box or loose seat buckles. I suggest paying attention to the source of the sound and noting its characteristics: whether it occurs during acceleration or at a steady speed, and if it changes when turning—this can help you quickly pinpoint the issue. Regular maintenance checks on the chassis and lubricating key joints are crucial—don't let small problems escalate into costly repairs.
The causes of abnormal noises are diverse. From a mechanical perspective, I'll share common scenarios. For instance, a squeaking sound from the engine compartment is likely due to aging belts or damaged pulley bearings; a rattling noise from the chassis while driving is often caused by loose suspension components such as shock absorber top mounts or linkages. A humming sound from the wheel area, especially when it gets louder at high speeds, might indicate worn wheel hub bearings. Abnormal tire noises, like a clicking sound while rolling, could be due to uneven tire pressure or worn tread blocks. A detached exhaust system hanger can also produce a clanging noise. When inspecting, listen carefully to the location: front, middle, or rear? Pay attention to the conditions under which the noise occurs, such as during acceleration or when turning. Bringing a phone recording to the repair shop makes it easier for the mechanic to diagnose the issue; early inspection can prevent minor problems from escalating into costly repairs.
