What Causes the Abnormal Noise When Accelerating the Car?
2 Answers
Abnormal noise when accelerating the car can be caused by the following reasons: Abnormal noise occurs only at idle or low speed: Excessive clearance between piston and cylinder wall; piston pin assembled too tightly or connecting rod bearing assembled too tightly; excessive clearance between tappet and its guide hole; wear of camshaft profile; sometimes, loose starter causing pulley noise (more noticeable when speed changes). Abnormal noise at a certain speed: Cracked camshaft timing gear or loose fixing nut; broken crankshaft; loose piston pin bushing; excessive axial clearance of camshaft or loose bushing. Abnormal noise during rapid acceleration: Loose connecting rod bearing, melted or mismatched bearing shell causing rotation; loose crankshaft bearing or melted bearing shell; broken piston pin; broken crankshaft.
Over the years of driving, I've encountered several types of acceleration-related abnormal noises. The most common is aging and cracking belts, especially during cold starts when accelerating, you'll hear a "squeaking" sound, like the harsh noise of chalk scraping on a blackboard. Secondly, pay attention to damaged exhaust pipe gaskets, which produce a "clattering" sound similar to metal sheets vibrating when accelerating. Last time during car repair, the mechanic also reminded me that turbocharger pipe leaks can cause a "hissing" sound, like a tire slowly losing air. If there's a "clanging" metal impact noise from the chassis during acceleration, it's likely due to loose driveshaft universal joints. The most dangerous is a loose timing chain, which produces a rhythmic "rattling" sound. It's advisable not to stomp on the accelerator when hearing abnormal noises and to get it checked promptly.
