What Causes Abnormal Noise When Starting the Car but No Sound While Driving?
3 Answers
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.
A while ago, my car kept making creaking noises when starting, but once it got moving, it became completely quiet, which felt quite odd. This issue might be related to the suspension system, such as aging control arm bushings or loose stabilizer bars, as these components bear the most pressure during the transition from stationary to moving. It could also be a problem with the brake system, like worn or uneven brake pads causing friction noises during startup. I think temperature plays a big role too—when the car is cold, parts contract more noticeably, making the sounds more apparent. In any case, I drove straight to the repair shop, and the mechanic fixed it by replacing some parts. I’d advise car owners not to delay and address such issues early to prevent major suspension or brake problems that could compromise driving safety.
A squeaking noise during startup that disappears after driving is often caused by uncoordinated transmission components. For example, severe wear on the clutch friction disc can produce a creaking sound when engaged. Insufficient transmission oil can also lead to similar noises, as the gears bear heavy loads during startup and lack proper lubrication. Aging flywheels or drive shaft bearings at engine idle may also generate abnormal sounds, which subside once the engine warms up. A simple inspection of fluid levels and component wear can be done, but professional diagnostic tools are usually required for accurate identification. Regular cleaning and lubrication of the transmission system can prevent such issues and avoid costly repairs.
