It is never enjoyable to find out a sound in your vehicle that you don’t know the cause of. So, what if you detect a loud noise that lasts on your BMW 3 Series? It is highly plausible that this is a minor trouble, but before beeing sure, it is better to do some investigations. Whether that loud noise comes from the front of the automobile, from the rear, whether it shows up when you accelerate or when you are parked, our team has created this content to help you fix it. First, we will summarize the possible explanations for the problem according to when loud noise shows up on your BMW 3 Series, and then we will concentrate on the region of origin of the noise. In any case, if this noise persists, follow these instructions to help you find the origin.
When does my BMW 3 Series make a loud noise?
One way to find a noise from your BMW 3 Series is to determine when it shows up. Indeed, some trouble can be linked to components that are only stressed under certain circumstances. It is this approach that we will focus on in this first part.
Loud noise BMW 3 Series when accelerating
Loud noise on BMW 3 Series that appears 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 induce a much higher noise than during normal use. In addition, it is also highly plausible that loud noise on your BMW 3 Series is in connection with a wheel bearing, which is one of the most common origins of these types of symptoms. Another possibility is that your exhaust pipe may have holes or a collar may have become loose. Finally, it is also plausible that the trouble may come from a deformed tire or an unbalanced wheel that will tend to vibrate as it gains speed.
When my BMW 3 Series is stopped
If your BMW 3 Series makes a loud noise while not accelerating, engine on, the trouble may be linked 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 3 Series and how can I be sure of its origin?
Now that we have determined the cause of the sound, we will concentrate on the verification step to be certain that this is the matter you are going through.
The loud noise comes from the wheels of my BMW 3 Series
As we have seen earlier in this article, loud noise from the wheels of your BMW 3 Series may be linked 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 swap it or them right away. If it is a deformed tire, remember to visually check the entire tread area for linearity. If it is the balancing of the wheels of your BMW 3 Series that is the matter, you will tend to feel a vibration in the direction of the car as you go faster. In both circumstances, you will have to go to your auto mechanic to swap the tires or do a balancing.
The loud noise comes from the engine of my BMW 3 Series
In case you have identified loud noise as coming from the engine of your BMW 3 Series, the two most likely causes are turbo and air intake. In the first case, a turbo failure may also be connected 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 3 Series is related to air intake, the control 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 cause 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 car to your service garage .
Loud noise comes from the exhaust pipe of the vehicle
If the noise you have discovered comes from the exhaust pipe of your BMW 3 Series, it is highly plausible that you have rust if your automobile is old and has created holes in it over time and therefore generates a very high noise close to aircraft noise on your BMW 3 Series, that a part has been cut off due to wear, or, finally, that a clamp has become loose due to vibrations. To validate this, get help from someone who will stand under the automobile while you accelerate to find the exact area of origin 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.