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What Causes the Abnormal Noise When Starting an Automatic Transmission Car?

1 Answers

VonBenjamin

07/30/25 2:16am

Automatic transmission cars produce a clunking sound 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 clunking noises. Excessively low engine RPM: Insufficient output torque can cause gear dragging, potentially leading to abnormal noises. During rapid acceleration when engine RPM rises extremely quickly, the transmission may produce an impact when shifting from 1st to 2nd gear. When heavily depressing the accelerator to raise RPM to 5000-6000 or higher, the transmission must suddenly reduce this high RPM to 2000-3000 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 use the foot brake to completely stop the vehicle first.

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