It is never relaxing to find out a noise in your vehicle that you don’t know the origin of. So, what if you identify a loud noise that continues on your BMW 4 Series? It is highly plausible that this is a minor issue, but before beeing sure, it is better to operate some checks. Whether that loud noise comes from the front of the vehicle, from the rear, whether it shows up when you accelerate or when you are parked, our team has made this content to help you fix it. First, we will point out the possible causes for the issue according to when loud noise shows up on your BMW 4 Series, and then we will concentrate on the region of origin of the noise. In any case, if this noise remains, follow these advice to help you find the origin.
When does my BMW 4 Series produce a loud noise?
One way to detect a noise from your BMW 4 Series is to identify when it appears. Indeed, some concerns can be connected to parts that are only stressed under certain conditions. It is this process that we will focus on in this first part.
Loud noise BMW 4 Series when accelerating
Loud noise on BMW 4 Series that starts when you are accelerating can be symptomatic of multiple failures. Indeed, if you feel a noise that is louder and louder when you accelerate, it can come from a faulty turbo that will cause a much higher noise than during normal use. Additionally, it is also highly plausible that loud noise on your BMW 4 Series is associated with a wheel bearing, which is one of the most common causes of these types of manifestations. Another possibility is that your exhaust pipe may have holes or a collar may have become loose. Finally, it is also plausible that the issue may come from a deformed tire or an unbalanced wheel that will tend to vibrate as it gains speed.
When my BMW 4 Series is stopped
If your BMW 4 Series makes a loud noise while not accelerating, engine on, the issue may be connected to poor air intake. An air intake hose that has come loose or has a hole in it may be the induce.
Where does loud noise come from on my BMW 4 Series and how can I be sure of its origin?
Now that we have located the cause of the noise, we will focus on the verification step to make sure that this is the matter you are having.
The loud noise comes from the wheels of my BMW 4 Series
As we have seen previously, loud noise from the wheels of your BMW 4 Series may be connected to two main disorders. If it is one of your tired bearings, it will tend to make a thumping noise that intensifies when it is under stress (spins faster and faster). So keep in mind to examine by driving “fast” (neutral gear on and window open to hear only the noise of the wheels) that the noise is located here, if this is the case change it or them right away. If it is a deformed tire, make sure to visually check the entire tread area for linearity. If it is the balancing of the wheels of your BMW 4 Series that is the trouble, you will tend to feel a vibration in the direction of the automobile as you go faster. In both situations, you will have to go to your mechanic to swap the tires or accomplish a balancing.
The loud noise comes from the engine of my BMW 4 Series
In case you have recognized loud noise as coming from the engine of your BMW 4 Series, the two most likely causes are turbo and air intake. In the first case, a turbo failure may also be associated with a compression loss during the engine ramp-up phase, so you should encounter a power loss during your acceleration. If the loud noise on your BMW 4 Series is related to air intake, the check will be done mainly visually, check all your air intake hoses by a visual control in your engine block to be sure that it is not damaged or disconnected which would generate an air intake, if it is just disconnected you can reconnect the air intake tubes yourself. Then examine that the engine idle speed is not random. In case you confirm one of these two trouble, take your automobile to your service garage .
Loud noise comes from the exhaust pipe of the vehicle
If the noise you have detected comes from the exhaust pipe of your BMW 4 Series, it is highly plausible that you have rust if your vehicle is old and has created holes in it over time and therefore generates a very high noise close to aircraft noise on your BMW 4 Series, that a part has been cut off due to wear, or, finally, that a clamp has become loose due to vibrations. To verify this, get help from someone who will stand under the vehicle while you accelerate to find the exact area of starting point of this noise. If it is a hole, you can repair it with a putty provided for this purpose, or, if it is a collar, “reattach” it. If it is cut or the hole is too big, it is better to get closer to your mechanic.