What Causes Abnormal Noise When Starting the Car but No Sound While Driving?

[VictoriaLynn]

There are several possible causes for abnormal noises coming from the engine compartment. Most people can identify the source of the noise as the engine compartment based on the sound, which is usually a metallic screeching or a wind-like noise. Below is an introduction to the engine: 1. Introduction: An engine is a machine that converts non-mechanical energy into mechanical energy. 2. Classification: Engines include internal combustion engines, external combustion engines, jet engines, electric motors, etc. An external combustion engine converts the heat energy generated by combustion into kinetic energy, and the steam engine improved by Watt is a typical example of an external combustion engine. An internal combustion engine, or reciprocating piston engine, differs from an external combustion engine in that the fuel burns inside it. A jet engine is an engine that directly generates thrust by the high-speed jet of gas from the nozzle.