It is never pleasant to hear a sound in your car that you don’t know the source of. So, what if you detect a loud noise that lasts on your Mercedes Classe A 4? It is very possible that this is a minor trouble, but before beeing sure, it is better to execute some checks. Whether that loud noise comes from the front of the vehicle, from the rear, whether it appears when you accelerate or when you are parked, our team has created this article to help you solve it. First, we will detail the possible reasons for the issue according to when loud noise shows up on your Mercedes Classe A 4, and then we will give attention to the region of origin of the noise. In any case, if this noise lasts, follow these recommendations to help you find the source.
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When does my Mercedes Classe A 4 generate a loud noise?
One way to identify a noise from your Mercedes Classe A 4 is to determine when it appears. Indeed, some complications can be connected to parts that are only stressed under certain occasions. It is this process that we will focus on in this first part.
Loud noise Mercedes Classe A 4 when accelerating
Loud noise on Mercedes Classe A 4 that starts when you are accelerating can be symptomatic of multiple failures. In fact, if you encounter 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. Furthermore, it is also highly possible that loud noise on your Mercedes Classe A 4 is in connection 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 possible that the trouble may come from a deformed tire or an unbalanced wheel that will tend to vibrate as it gains speed.
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When my Mercedes Classe A 4 is stopped
If your Mercedes Classe A 4 makes a loud noise while not accelerating, engine on, the trouble may be related to poor air intake. An air intake hose that has come loose or has a hole in it may be the reason.
Where does loud noise come from on my Mercedes Classe A 4 and how can I be sure of its origin?
Now that we have uncovered the cause of the sound, we will look into the verification stage to be certain that this is the concern you are having.
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The loud noise comes from the wheels of my Mercedes Classe A 4
As we have seen previously, loud noise from the wheels of your Mercedes Classe A 4 may be related to two main complications. 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 remember 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, don’t forget to visually check the entire tread area for linearity. If it is the balancing of the wheels of your Mercedes Classe A 4 that is the trouble, you will tend to feel a vibration in the direction of the vehicle as you go faster. In both circumstances, you will have to go to your mechanic to swap the tires or execute a balancing.
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The loud noise comes from the engine of my Mercedes Classe A 4
In case you have identified loud noise as coming from the engine of your Mercedes Classe A 4, 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 experience a power loss during your acceleration. If the loud noise on your Mercedes Classe A 4 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 induce 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 problems, take your vehicle to your garage .
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Loud noise comes from the exhaust pipe of the vehicle
If the noise you have detected comes from the exhaust pipe of your Mercedes Classe A 4, it is highly possible 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 Mercedes Classe A 4, that a part has been cut off due to wear, or, finally, that a clamp has become loose due to vibrations. To ensure this, get help from someone who will stand under the vehicle while you accelerate to find the exact area of source 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.
