It is never pleasing to notice a sound you don’t know about, and which results from your car. So, what if you discover an exhaust noise that is persistant on your BMW 7 Series? It is highly probable that this is a minimal problem, however, before being sure, it is better to conduct some investigations. Our team has produced this to support you resolve it. First, we will look at the possible reasons if you have a muffled exhaust sound on your BMW 7 Series and second, if you have a metallic rattling noise on your BMW 7 Series.
Muffled exhaust noise BMW 7 Series
Exhaust pipe with holes BMW 7 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 finally become dirty, for example. If you have an exhaust noise on your BMW 7 Series, it is possible that it is due to a hole in the exhaust pipe, this is the most typical reason. To be able to verify this, situate someone under the running motor vehicle and accelerate to help them recognize 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 replaced.
Element dislocated exhaust pipe BMW 7 Series
The other possibility of being the subject of a muffled exhaust noise on BMW 7 Series is to have a part of the exhaust system that has dislocated because of vibrations for example. Indeed some junctions of the different parts of the pot can loosen over time 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 7 Series to discover the problem location, and tighten or swap the bolts. If you hear a muffled sound but after examining it doesn’t seem to come from the pot itself, consider looking at this article which gives answers gives solutions about rear end noises on BMW 7 Series.
Metal rattling exhaust sound BMW 7 Series
Damaged exhaust muffler noise BMW 7 Series
If, on the other hand, you are subject to an exhaust sound that is more of a metallic type of, it is possible that one or more parts of your exhaust may be damaged. Indeed, it is possible that either your baffles, the catalyst or the silencer are the induce of this noise. To be certain, go under your BMW 7 Series, cold, and tap each of the previously stated parts with a hammer to discover 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 dead 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 7 Series, you will either have to find a used one and do it yourself, or go to your auto technician.
Metal rattling exhaust noise BMW 7 Series : Silentblock, loose pot
Finally, a metallic exhaust noise on your BMW 7 Series may be in connection with a poor attachment of your exhaust to your vehicle. Indeed, after some time, vibrations, the pot fasteners on the vehicle chassis can come off. In this case, you need to verify, 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 unit, the more fixed it should be. Visually verify 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 replaced.
