Why is the ignition sound of BMW X3 so loud?
2 Answers
The reason why the ignition sound of BMW X3 is so loud is that the cold start high idle speed is relatively louder, and there is also the air compression sound from the secondary air pump. Combined, it makes the sound feel louder. If the ignition sound is explosive or the engine stalls after ignition, it is recommended to check the spark plugs at a repair shop and also clean the car's fuel lines. Additional information: 1. If the engine sound is louder during a cold start but becomes quiet after one minute, and the sound is much smaller during a hot start, this is normal. This is because after parking, the engine oil automatically flows back to the oil pan. During a cold start the next day, the oil will slowly return from the oil pan to the vicinity of the cylinder head. 2. During a hot start, the engine oil has already circulated properly, providing good lubrication and sealing, so the sound is naturally smaller. Therefore, the sound during a cold start will be louder, but it won't last long, at most 2 minutes. If the engine roars for an extended period, it should be checked at a repair shop as soon as possible. 3. If the engine sound is loud during a cold start and also produces a squeaking noise, then check the condition of the engine oil. If low-quality gasoline is used, it can lead to reduced engine power, increased carbon deposits inside the engine, and increased engine noise.
When driving my BMW X3, I always feel that the startup sound is particularly loud, which is actually related to its engine design. BMW uses an inline six-cylinder engine, which requires high horsepower to compress the cylinders at startup, naturally resulting in a louder sound. Additionally, the fuel injection system increases the fuel volume during cold starts to quickly raise the temperature, producing that rumbling noise. I've discussed this in car enthusiast groups, and many people say it's a signature characteristic of BMW, representing strong performance. In daily driving, especially when starting in underground parking lots, the sound is particularly noticeable, but there's no need to worry. Only if the sound is abnormal or has noise, such as a harsh friction sound, should you take it to the dealership to check the starter motor or belt. After all, regular car maintenance can prevent problems, and I need to remind myself not to overlook the engine's condition.
