It is rarely pleasing to listen to a sound you don’t know about, and which comes from your car. Thus, what if you find an exhaust noise that continues on your BMW 4 Series? It is highly probable that this is a small problem, however, before being sure, it is better to operate some checks. Our team has produced this to support you solve it. First, we will look at the possible reasons if you have a muffled exhaust sound on your BMW 4 Series and second, if you have a metallic rattling noise on your BMW 4 Series.exhaust-noise-bmw-4-series

Muffled exhaust noise BMW 4 Series

Exhaust pipe with holes BMW 4 Series

Having a muffled sound from its exhaust is not insignificant and can end in over-consumption, or a malfunction of the car engine, which could after a while become dirty, for example. If you have an exhaust noise on your BMW 4 Series, it is plausible that it is due to a crack in the exhaust pipe, this is the most usual reason. To be able to validate this, position a friend or relative under the running motor automobile and accelerate to help them identify the source of the hole. Once found, if it is not too large you can cold seal it with specific metallic mastic type legs. Otherwise, the section will have to be changed.

Element dislocated exhaust pipe BMW 4 Series

The other possibility of being confronted with a muffled exhaust noise on BMW 4 Series is to have a part of the exhaust device that has dislocated caused by vibrations for example. Indeed some junctions of the different parts of the pot can loosen after a while and generate an exhaust gas leak in places not intended for this purpose. These fumes will then make a loud noise. Same technique as above, we go under the BMW 4 Series to establish the problem location, and tighten or replace the bolts. If you hear a muffled sound but after verifying it doesn’t seem to come from the pot itself, think about looking at this content page which gives answers gives solutions about rear end noises on BMW 4 Series.

Metal rattling exhaust sound BMW 4 Series

Damaged exhaust muffler noise BMW 4 Series

If, alternatively, you are subject to an exhaust sound that is more of a metallic type, it is plausible that one or more parts of your exhaust may be damaged. Indeed, it is conceivable that either your baffles, the catalyst or the silencer are the cause of this noise. To make sure, go under your BMW 4 Series, cold, and tap each of the previously stated parts with a hammer to establish the source of the noise. You should move things between things in the problematic part, if they are baffles, you can try to push the section a little bit to try to block them and thus limit their movements. If it is a out of date catalyst, it will be necessary to consider changing it, as well as the silencer. In this case, to stop the exhaust noise on your BMW 4 Series, you will either have to find a resale one and do it yourself, or go to your technician.

Metal rattling exhaust noise BMW 4 Series : Silentblock, loose pot

Finally, a metallic exhaust noise on your BMW 4 Series may be in connection with a poor attachment of your exhaust to your automobile. Indeed, over time, vibrations, the pot fasteners on the automobile chassis can come off. In this case, you need to examine, when cold, that the pot holds well, to try to get it to move in different directions and watch how it behaves. Backwards there should be some play and be able to move but not too much. The closer you get to the engine motor, the more fixed it should be. Visually examine the fasteners for which you have doubts. Finally, it is possible that a silentbloc may have died . In this case it will have to be changed.