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.

[LeCatherine]

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.

[EmilioRose]

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.

[LaJuliette]

The car makes noise when starting but not while running. The most common causes are chassis component issues, such as worn control arm bushings or uneven brake rotors. Another possibility is aging suspension bushings, which create friction noise during stop-and-go situations. This is more likely to happen during cold starts due to component contraction and insufficient lubrication. The noise is masked by vibrations when the car is in motion. It's recommended to first check for any loose chassis components yourself, but a professional inspection is more reliable. Avoid driving recklessly to prevent accidents.

[VictoriaRose]

The situation of abnormal noise at start-up but silence during running, I feel it's definitely related to the braking system. Either the brake pads are too thin or the calipers are loose, causing friction noise during low-speed movement. Aging of the suspension's adhesive bushings is also common, producing squeaking sounds when starting due to impact. It's more noticeable in cold weather as components harden and become more prone to making noise. The preventive method is to regularly inspect suspension and braking components, lubricating or replacing them when necessary, which can save a lot on repair costs.

[KylieMarie]

I've experienced a clunking noise when starting the car that disappears after driving, which likely involves aging issues with the drive shaft or suspension bushings. Clutch problems such as worn friction plates can also cause noise during engagement but become silent once running smoothly. Another factor is component gaps caused by thermal contraction in cold temperatures leading to noise. It's recommended to start with simple checks, like gently applying the brakes to see if the noise persists, but ultimately getting a comprehensive inspection at a professional shop is safest to prevent minor issues from escalating into major problems affecting driving reliability.