What Causes the Clicking Noise When Starting an Automatic Transmission Car?
1 Answers
Automatic transmission cars produce a clicking noise when starting due to internal transmission issues and excessively low engine RPM. Internal transmission problems: Excessive wear creates gaps, resulting in play during startup that causes the clicking noise. Excessively low engine RPM: Insufficient output torque can cause gear dragging, which may also produce abnormal sounds. During rapid acceleration when engine RPM rises extremely quickly, the transmission generates an impact when shifting from 1st to 2nd gear. When heavily depressing the accelerator to raise RPM to 5,000-6,000 or higher, the transmission must suddenly reduce this high RPM to 2,000-3,000 through gear shifting to stabilize engine speed, creating impact during this process. Maintenance methods: Replace transmission fluid and perform comprehensive transmission maintenance. Additionally, avoid aggressive daily driving to prevent accelerated transmission wear. Another important note: regardless of gear shifting operations, always ensure the vehicle is completely stopped using the foot brake first.