Is the loud noise normal after starting a BMW X4?

[MacFernando]

Normal. This is the specially tuned exhaust sound by BMW. The noise is louder right after startup, somewhat similar to the startup sound of a coupe with dual exhaust pipes. The sound will diminish within a dozen seconds after starting, and it does not affect the vehicle's performance, nor is it caused by engine faults or other issues. Here is more information about the BMW X4: 1. The BMW X4 is developed based on the CLAR modular chassis. 2. It is equipped with a 3.0L L6 turbocharged diesel engine, delivering a maximum power output of 240kW (326PS) and a peak torque of 680Nm, with a 0-100km/h acceleration time of 4.9s.

[DeAbel]

It's quite common for my BMW X4 to make loud noises when starting, especially in the morning or during cold winter starts. The engine noise roars like it's warming up, usually settling down after about 30 seconds to a minute. This is normal—BMW's turbocharged system is designed to preheat the exhaust pipes and catalytic converter during cold starts, resulting in louder noise but without affecting driving performance. However, if the noise doesn’t subside after startup and is accompanied by strange clicking sounds or vibrations, you should be cautious—it might indicate an exhaust leak or loose engine components. Having driven this car for several years, I’ve rarely encountered such issues. Regular maintenance and professional inspections of the engine and exhaust system usually keep things running smoothly. Don’t worry about normal noises—they’re just part of the car’s character. Just keep an eye on it.

[DylanLynn]

As someone who enjoys tinkering with cars, I think the loud startup sound of a BMW X4 is quite normal. It's mostly due to the engine needing to run quickly during cold starts to heat up the system, especially the movement caused by the exhaust manifold and oil pump. It will stabilize after a few dozen seconds, so don't worry. However, if you notice the noise is unusually loud, like metal banging, or it doesn't stop, there might be an issue, such as a damaged exhaust pipe or faulty fuel injector. I recommend first listening to the type of sound yourself, then consulting a reliable technician for further inspection. High-end cars like BMW are designed with noise control in mind. Paying attention to your car's condition and avoiding frequent starts in extreme temperatures can extend its lifespan. Remember, a quiet sound doesn't necessarily mean everything's fine, and a loud sound doesn't always indicate a problem—the key is understanding the patterns.

[OXavier]

From experience, the loud startup noise of the BMW X4 is usually a normal cold-start phenomenon, with the engine producing noticeable sounds during the warm-up phase—this design protects the system from overheating. However, if the noise suddenly becomes abnormal after startup or is accompanied by severe vibrations, it could indicate an exhaust system leak or spark plug malfunction. While such issues are uncommon, they shouldn't be ignored; prompt inspection can prevent potential hazards. I understand driving safety is paramount, and BMW engineers have optimized noise levels. Regular cleaning and scheduled maintenance are crucial.

[DelSamuel]

If your BMW X4 makes a loud noise when starting up, don't panic—it's common during cold starts. The engine needs to warm up when cold, so the noise is higher but will decrease after about a minute. As a new owner, I suggest paying attention to the following: if the noise persists during summer starts, or if there's a strange smell or smoke after parking, it could indicate engine carbon buildup or exhaust pipe damage. This may affect fuel efficiency and safety. A simple solution is to check the oil level and exhaust pipe condition monthly. If the noise is abnormal, visit a professional repair shop promptly. BMW is known for its reliability, so don't worry too much about normal noise—safe driving comes first.