What is the reason for the abnormal noise during car idling that disappears when the clutch is pressed?
2 Answers
The reason for the abnormal noise during car idling that disappears when the clutch is pressed is due to issues with the clutch pressure plate, release bearing, or gear bearings inside the transmission. The clutch is a crucial component in the vehicle's transmission system, installed between the engine and the gearbox, capable of connecting or disconnecting the engine from the transmission. The functions of the clutch include: 1. Facilitating gear shifting and preventing overload in the transmission system; 2. Ensuring that the engine's crankshaft and transmission device can transmit or cut off the engine's power output according to the needs of the vehicle's operation; 3. Assisting the car in starting smoothly. During driving, the driver can press or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the gearbox, thereby cutting off or transmitting the engine's power input to the transmission.
Oh, I've encountered this issue too. My car always makes a rustling sound at idle, but the noise disappears when I press the clutch pedal. The main reason is that the clutch release bearing is worn or improperly installed. At idle, the engine is running but the drivetrain is unloaded. If the release bearing is aged or loose, it will cause friction noise; pressing the clutch applies pressure and stops the noise. Other possibilities include damage to the needle roller bearing on the flywheel or issues with the input shaft bearing, which can also cause similar noises. Don’t underestimate it—I ignored it for a while, and the noise got worse. Later, at the repair shop, replacing the release bearing only cost a few hundred bucks, but delaying could lead to clutch disc damage and higher costs. I recommend going to a professional shop ASAP for inspection. Let the technician use diagnostic tools to pinpoint the exact issue—safety first.
