Why does the car make a clicking sound when starting at low speed?
2 Answers
When the car makes a clicking sound while accelerating at low speeds, it may be coming from the transmission. For manual transmission models, the possible causes of the abnormal sound include incomplete clutch disengagement, the presence of gear debris causing collisions between gears, or damaged gears. For automatic transmission models, the issue might lie with the gear set, which requires immediate repair. The reasons for the clicking sound during low-speed starts are as follows: 1. Transmission oil operating in high-temperature and high-pressure environments can produce a lot of sludge and impurities: This thickens the transmission oil, reducing its fluidity and causing direct friction between components without a protective layer, thereby increasing mechanical wear and leading to abnormal sounds. 2. Transmission oil needs replacement: Automatic transmission oil is generally replaced every 2 years or 40,000 kilometers, while manual transmission oil is serviced every 3 years or over 60,000 kilometers. For repaired transmissions, it is strongly recommended to perform the first maintenance at 3,000 kilometers, followed by replacement every year or 20,000 kilometers.
I've driven manual transmission cars for over 20 years, and the grinding noise during startup is mostly due to clutch problems. When the clutch disc wears thin or the pressure plate deforms, it will slip and produce metal friction sounds during semi-engagement. If the synchronizer in the transmission is worn, it can also cause this, especially when shifting into first gear. Another possibility is excessive wear on the universal joint of the driveshaft, making the grinding noise louder when starting during turns. Last time, my friend's car had a torn CV boot, allowing dirt to enter and damage the bearing. I recommend not delaying and getting it checked at a repair shop early, otherwise you might suddenly break down on the road. Remember to gently press the accelerator and slowly release the clutch during startup to extend the lifespan of the parts.