What Causes Abnormal Engine Ignition Sounds?

1 Answers
ParkerAnn
07/30/25 8:59am
Engine ignition sounds abnormal for the following reasons: Belt Slippage: When starting the car, there is a sharp squealing noise. This squealing sound is caused by belt slippage, which may be due to insufficient tension from the tensioner pulley or the belt being stretched from prolonged use, making it too loose. For a normal belt and tensioner pulley, when you twist the belt slightly with your hand, it should not twist more than 90 degrees. If the belt can be twisted over 90 degrees with little effort, it indicates that the belt or tensioner pulley is loose. Gear Grinding: When starting the car, there is a clicking or grinding noise. This sound is caused by the starter gear grinding against the engine flywheel gear. The reason is that after prolonged and frequent use, the gears on both the starter and flywheel wear down significantly, leading to misalignment and grinding sounds.
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