Why is the BMW X3 engine noise loud?

[RebeccaAnn]

BMW X3 engine noise loud reasons are as follows: 1. Engine reason: The four-cylinder engine uses an N20 engine fuel injector and has an additional high-pressure pump inside the cylinder block, resulting in louder noise. 2. Installed valve: One of the BMW's dual exhaust pipes is equipped with a valve that does not open at low speeds, so the idle speed is high at startup, causing loud noise. This is a normal phenomenon, and the noise will decrease after a dozen seconds. Relevant information about the BMW X3 is as follows: 1. Power aspect: There are three power options available for the 2.0T engine - low, standard, and high. The low power is called 25i, the standard power is 28i, and the high power is 30i. The transmission is uniformly 8AT, and the four-wheel drive system is standard across the entire series. 2. Chassis structure: It features a front double-ball-joint shock absorber suspension and a rear multi-link independent suspension, equipped with an intelligent four-wheel drive system. The central differential is a multi-plate clutch type, adopting a unibody structure.