What Causes the Buzzing Sound After Starting the Car?
1 Answers
Car starting with a buzzing sound may be due to cold start conditions or engine resonance. The specific explanations and corresponding measures for these two causes are as follows: Cold start conditions: If it's a cold start, the engine sound may be louder initially but tends to quiet down after about a minute. During a hot start, the sound is much quieter, which is normal. This happens because after parking, the engine oil automatically flows back to the oil pan. During a cold start the next day, the oil slowly returns from the oil pan to the vicinity of the cylinder head. In a hot start, the engine oil is already in place, ensuring good lubrication and sealing, so the sound is naturally quieter. Therefore, the sound during a cold start is louder but doesn't last long, typically no more than 2 minutes. In this case, simply remember to warm up the car before driving to avoid cold starts. However, if the engine roars for an extended period, it's advisable to have it checked at a repair station as soon as possible. Engine resonance phenomenon: If the engine sound is loud during startup and there is resonance, it can also lead to increased engine noise. A creaking sound is likely caused by the aging of the water pump belt or engine belt, leading to slipping and abnormal noise, or due to lack of lubrication in components like the water pump impeller, water pump bearings, or generator bearings, resulting in wear. In such cases, it's necessary to replace the water pump belt or engine belt.
