It is rarely pleasing to hear a sound you don’t know about, and which results from your car. So, what if you detect an exhaust noise that persists on your Audi S4? It is highly probable that this is a small issue, however, before being sure, it is better to operate some investigations. Our team has produced this to help you solve it. First, we will look at the possible causes if you have a muffled exhaust sound on your Audi S4 and second, if you have a metallic rattling noise on your Audi S4.
Muffled exhaust noise Audi S4
Exhaust pipe with holes Audi S4
Having a muffled sound from its exhaust is not insignificant and can end up in over-consumption, or a malfunction of the engine, which could in time become dirty, for example. If you have an exhaust noise on your Audi S4, it is possible that it is due to a hole in the exhaust pipe, this is the most usual explanation. In order to verify this, locate someone under the running motor vehicle and accelerate to help them identify the starting point of the hole. Once identified, if it is not too large you can cold seal it with specific metallic mastic type legs. Otherwise, the section will have to be swapped.
Element dislocated exhaust pipe Audi S4
The other possibility of being the subject of a muffled exhaust noise on Audi S4 is to have a part of the exhaust system that has dislocated resulting from vibrations for example. Indeed some junctions of the different parts of the pot can loosen after some time and generate an exhaust gas leak in places not intended for this purpose. These fumes will then create a loud noise. Same technique as above, we go under the Audi S4 to discern the issue region, 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, consider looking at this content page which gives answers gives solutions about rear end noises on Audi S4.
Metal rattling exhaust sound Audi S4
Damaged exhaust muffler noise Audi S4
If, on the other hand, you are exposed 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 injured. Indeed, it is possible that either your baffles, the catalyst or the silencer are the reason of this noise. To be sure, go under your Audi S4, cold, and tap each of the previously stated parts with a hammer to discern 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 Audi S4, you will either have to find a used one and do it yourself, or go to your auto technician.
Metal rattling exhaust noise Audi S4 : Silentblock, loose pot
Finally, a metallic exhaust noise on your Audi S4 may be linked to a poor attachment of your exhaust to your vehicle. Indeed, over 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 reacts. 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 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 swapped.
