What Causes Excessive Idle Noise in Cars?

[ThomasLynn]

Reasons for excessive engine noise in cars: 1. Engine Oil: If the oil viscosity is too high, it can cause operational issues in the engine, reducing lubrication effectiveness and leading to increased engine noise. Therefore, promptly visit a repair shop to check if the oil needs replacement, or calculate whether it's time for maintenance. 2. Belt: Inspect the belt for looseness. A loose belt can amplify noise in the engine compartment. 3. Coolant Temperature: Excessive engine noise may also result from high coolant temperature. Check if the temperature gauge is normal and if there's any smoke in the engine compartment. Ensure to replace the coolant before winter. 4. Idle Speed: If the noise is particularly noticeable during idling and the idle speed is high, it might be time to clean the throttle body, intake tract, and fuel injectors, especially the throttle body. 5. Sound Insulation: If the engine sounds normal outside but noisy inside the car, the vehicle's sound insulation may be poor. Check the sealing strips for aging and consider enhancing the vehicle's sealing to reduce noise.