It is never relaxing to find out a noise in your vehicle that you don’t know the cause of. So, what if you recognize a loud noise that lasts on your Mercedes Classe A? 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 vehicle, from the rear, whether it happens when you accelerate or when you are parked, our team has written this article to help you solve it. First, we will point out the possible reasons for the issue according to when loud noise appears on your Mercedes Classe A, and then we will look into the region of origin of the noise. In any case, if this noise continues, follow these recommendations to help you find the source.
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When does my Mercedes Classe A produce a loud noise?
One way to identify a noise from your Mercedes Classe A is to establish when it appears. Indeed, some problems can be linked to components that are only stressed under certain types of conditions. It is this technique that we will focus on in this first part.
Loud noise Mercedes Classe A when accelerating
Loud noise on Mercedes Classe A that takes place when you are accelerating can be symptomatic of several 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 create a much higher noise than during normal process. Moreover, it is also highly plausible that loud noise on your Mercedes Classe A is linked to a wheel bearing, which is one of the most common origins 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 trouble may come from a deformed tire or an unbalanced wheel that will tend to vibrate as it increases speed.
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When my Mercedes Classe A is stopped
If your Mercedes Classe A 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 reason.
Where does loud noise come from on my Mercedes Classe A and how can I be sure of its origin?
Now that we have defined the cause of the noise, we will look into the verification step to be sure that this is the issues you are going through.
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The loud noise comes from the wheels of my Mercedes Classe A
As we have seen before, loud noise from the wheels of your Mercedes Classe A may be linked to two main problems. 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 consider to verify 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 quickly. 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 Mercedes Classe A that is the issue, you will tend to feel a vibration in the direction of the vehicle as you go faster. In both situations, you will have to go to your auto mechanic to swap the tires or accomplish a balancing.
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The loud noise comes from the engine of my Mercedes Classe A
In case you have recognized loud noise as coming from the engine of your Mercedes Classe A, the two most likely causes are turbo and air intake. In the first case, a turbo failure may also be connected to 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 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 induce an air intake, if it is just disconnected you can reconnect the air intake tubes yourself. Then verify that the engine idle speed is not random. In case you confirm one of these two trouble, 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 perceived comes from the exhaust pipe of your Mercedes Classe A, 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 Mercedes Classe A, 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 vehicle 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.
