It is never pleasing to discover a sound you don’t know about, and which comes from your car. So, what if you discover an exhaust noise that is persistant on your Lexus IS? It is highly possible that this is a small issue, however, before being sure, it is better to conduct some verifications. Our team has produced this to support you resolve it. First, we will look at the possible causes if you have a muffled exhaust sound on your Lexus IS and second, if you have a metallic rattling noise on your Lexus IS.
Muffled exhaust noise Lexus IS
Exhaust pipe with holes Lexus IS
Having a muffled sound from its exhaust is not insignificant and can cause over-consumption, or a malfunction of the engine, which could finally become dirty, for example. If you have an exhaust noise on your Lexus IS, it is plausible that it is due to a crack in the exhaust pipe, this is the most usual explanation. To be able to verify this, locate someone under the running motor car and accelerate to help them find the source 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 replaced.
Element dislocated exhaust pipe Lexus IS
The other possibility of being suffering from a muffled exhaust noise on Lexus IS is to have a part of the exhaust device that has dislocated as a consequence of vibrations for example. Indeed some junctions of the different parts of the pot can loosen along with time and generate an exhaust gas leak in places not intended for this purpose. These fumes will then generate a loud noise. Same technique as above, we go under the Lexus IS to establish the issue area, and tighten or swap the bolts. If you hear a muffled sound but after verifying it doesn’t seem to come from the pot itself, consider having a look at this article which gives solutions gives solutions about rear end noises on Lexus IS.
Metal rattling exhaust sound Lexus IS
Damaged exhaust muffler noise Lexus IS
If, on the other hand, 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 reason of this noise. To be sure, go under your Lexus IS, 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 dead catalyst, it will be necessary to consider replacing it, as well as the silencer. In this case, to stop the exhaust noise on your Lexus IS, you will either have to find a second hand one and do it yourself, or go to your auto mechanic.
Metal rattling exhaust noise Lexus IS : Silentblock, loose pot
Finally, a metallic exhaust noise on your Lexus IS may be linked to a poor attachment of your exhaust to your car. Indeed, as time passes, vibrations, the pot fasteners on the car 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 unit, 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 replaced.
