What is the reason for the abnormal noise at idle speed that disappears when the clutch is pressed?
2 Answers
The reasons for the abnormal noise at idle speed that disappears when the clutch is pressed: It may be caused by the loosening of the release bearing on the clutch, or it could be due to loose input shaft bearing of the transmission, transmission gear failure, or transmission fork failure. When there is noise in the engine compartment and the noise disappears when the clutch is pressed, it can be determined that the noise originates from the transmission side, specifically the area of the clutch and transmission. To check the noise from the clutch release bearing, this is caused by the loosening or detachment of the release bearing. The shaking produces a rattling noise, and pressing the clutch pedal presses the bearing against the clutch pressure plate, causing the bearing to rotate and the noise to disappear. Replacing the release bearing will solve the issue.
I've always had a research interest in cars, and this issue is quite common. The abnormal noise at idle that disappears when the clutch is depressed is usually due to a problem with the clutch release bearing. At idle, the engine's power is transmitted to the transmission input shaft, and if the bearing is worn or damaged, it will produce a buzzing sound; when the clutch is depressed, the power is cut off, and the noise disappears. Sometimes, the transmission input shaft bearing can have similar issues, and faults in the flywheel or torque converter can also cause similar noises. Don't ignore these small sounds. If not repaired in time, it could lead to the entire clutch failing, even affecting driving safety. I recommend going to a professional shop for a check-up as soon as possible. Bearing inspections are straightforward, and replacing parts isn't expensive. Paying more attention to the clutch system during regular maintenance can prevent such issues, avoiding sudden stalls on the road that could cause trouble. In short, early detection and treatment can save a lot of money and safety risks.
