Is a Loud Bang Sound During Car Ignition Serious?

1 Answers
LaLola
07/30/25 3:34am
Here are the specific reasons for abnormal noises during car ignition: 1. Belt slippage: This could be due to insufficient tension from the tensioner pulley or the belt being stretched over time, making it too loose. 2. Gear grinding: Caused by the starter motor gear and the engine flywheel gear grinding against each other, often due to prolonged use leading to significant gear wear and misalignment. 3. Valve closing sound: In an engine, the valve train is typically the noisiest component. The sound of intake and exhaust valves closing is usually audible after startup. 4. Prolonged parking: If the vehicle has been parked for an extended period, the engine oil may drain back into the oil pan. During ignition, metal friction sounds may occur as components lack sufficient lubrication, but these will disappear once oil pressure builds up.
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