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What Causes Abnormal Noises After Starting the Car?

1 Answers

DiDante

07/29/25 8:26pm

Abnormal noises after starting the car are usually the sound of the fuel pump working. Below are the reasons for abnormal noises when starting a car: 1. Working Principle: After the vehicle starts, the starter gear may engage with the engine flywheel ring gear. The starter gear is adjusted by an electromagnetic coil, which may produce a buzzing sound during operation. These sounds are generally normal. 2. After Starting the Car: The abnormal noise is the sound of the fuel pump working. Once powered, the fuel pump starts operating to prepare for engine startup. If the fuel pump does not work after power is applied, the fuel injection system will not have sufficient injection pressure during engine startup, leading to difficulties in starting the engine.

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