When you find out about uncommon sounds on your BMW 4 Series you tend to worry about them. Specifically when you feel a noise when you accelerate on your BMW 4 Series. It is automatically assimilated to an engine motor trouble and can therefore be serious. As we know that you do not take these trouble lightly, we have made a decision to write this article to support you find the causes and eliminate this issues as quickly as possible. To do this, we will first see what are the oeigins of a high pitched noise when accelerating with my BMW 4 Series, then what is a whistling or ratling noise at the acceleration of my BMW 4 Series, then the origins of a noise that intensifies during acceleration and at last a noise that ends when I stop accelerating.noise-when-acceleratingbmw-4-series

Ma BMW 4 Series makes a high-pitched noise when I accelerate:

If your BMW 4 Series generates a loud noise when you accelerate, it is quite possible that the alternator belt is the induce of your trouble. You will need to establish if this noise takes place abruptly and if it can stop as it started. The alternator belt is a wearing part that is employed to bring power to the secondary components of your BMW 4 Series’s engine and although it is less vital than the timing belt it can induce engine troubles if it stops working. This sound may be a warning sign of a slackened belt, in which case the tensioner roller or its wear and tear may be at fault. In any case, check the condition of your belt and its tension. If it causes this acceleration noise on BMW 4 Series, go to your technician.

Ma BMW 4 Series makes whining noise when I accelerate:

  • Rattling or whistling noise caused by the turbo
  • If you have a power loss that occurs with the rattling noise when you accelerate with your BMW 4 Series, it is plausible that your turbo is failing and some of its components are at the end of their life. Examine it and swap it if it is the induce, otherwise you risk clogging your engine in the long run. If you find out this blowing or whistling sound on your car, feel free to consult this document about turbo noises on BMW 4 Series, if you would like more info.

  • Humming noise caused by air leakage
  • If, on the other hand, you do not experience any power loss due to an humming noise on your BMW 4 Series, it is more than likely that you have one of your junctions or air hoses that has holes. So check the entire air supply system from your air filter to your engine to determine the source of this acceleration sound.

Ma BMW 4 Series generates an increasingly loud noise when I accelerate:

If, on the other hand, you have the feeling that the more you gain speed, the more your noise at acceleration on BMW 4 Series gets loud, then you will have to think about the rolling parts of your car. In fact, if this loud noise does not surface when you iddle, it is certainly related to your transmission, and, in general, to your wheels. The most common reason is the state of your bearings, so make sure to check their condition to be sure it is not the reason of this loud noise when you accelerate. If not, go to this content page about the noises related to BMW 4 Series noise wheels.

Ma BMW 4 Series makes a noise when I accelerate that ceases when I stop accelerating:

At last, if you experience a noise when accelerating with your BMW 4 Series and this noise which could be a cliking sound tends to end when you disengage (press the clutch pedal), then one of the wear parts of your clutch system may be the reason. In fact, the clutch release bearings must be changed approximately every 120 000 / 130 000km. To test it, you just have to see if you have more difficulty than usual shifting gears, if you feel a resistance either stronger or non-existent in the clutch pedal. If you have any of these manifestations, go to your auto mechanic to change the clutch release bearings on your BMW 4 Series. Look at our article on clutch noise on BMW 4 Series for more information.