What Causes Loud Engine Noise When Accelerating?

[VanZoey]

When pressing the accelerator pedal, the engine noise becomes louder due to the following reasons: 1. The pipe connecting the air intake grille to the air filter is loose - simply secure it with tape. 2. The external belt is squealing - this requires repair at a 4S shop. 3. Issues with internal engine mechanical components - if under warranty, immediately report to a 4S shop for inspection and repair. Below are common engine problems: 1. Abnormal engine vibration: The most common cause is idle vibration due to dirty throttle body. Other causes include faulty spark plugs, damaged ignition coils, or mechanical engine failures. 2. Severe engine carbon buildup: The main causes are using low-quality engine oil and fuel. Engines with severe carbon buildup typically exhibit symptoms like idle vibration, weak acceleration, high fuel consumption, and difficulty starting when cold. 3. Engine overheating: The normal operating temperature range is between 80~90°C. Temperatures exceeding this range indicate engine overheating. Excessive engine temperature can even lead to severe mechanical failures like cylinder scoring or bearing seizure.