What Causes the Clicking Noise When Starting an Automatic Transmission Car?
1 Answers
Automatic transmission cars produce abnormal noises during startup due to issues in the engine compartment or transmission, which may be related to certain gears. Below are the specific causes: Noises from the Engine Compartment: Engine noises can originate from various sources in the engine compartment. Most people identify these noises by their sound source, which often manifests as metallic screeching or whistling sounds. Transmission Noise Symptoms: If there is a "rustling" sound from the transmission while driving, which disappears when the clutch or accelerator is pressed, or if there is a whistling-like sound during gear shifts, these are signs of transmission issues. Relation to Certain Gears: This is crucial for diagnosing transmission faults. If noise occurs in a specific gear, it is likely related to components affecting that gear's transmission. If noise is present in all gears, it may indicate a fault in the constant-mesh gear shaft or insufficient transmission oil. Observing whether the noise is linked to specific actions—such as shifting gears, starting, rapid acceleration, deceleration, or turning—can help diagnose the issue. Changes in speed and direction are particularly useful for identifying rear axle problems.
