It is never pleasing to perceive a sound you don’t know about, and which comes from your car. So, what if you identify an exhaust noise that remains on your GMC Sierra? It is highly possible that this is a minor issue, however, before being sure, it is better to execute some inspections. Our team has created this to support you solve it. First, we will look at the possible reasons if you have a muffled exhaust sound on your GMC Sierra and second, if you have a metallic rattling noise on your GMC Sierra.
Muffled exhaust noise GMC Sierra
Exhaust pipe with holes GMC Sierra
Having a muffled sound from its exhaust is not insignificant and can end up in over-consumption, or a malfunction of the car engine, which could in the end become dirty, for example. If you have an exhaust noise on your GMC Sierra, it is possible that it is due to a crack in the exhaust pipe, this is the most classic reason. In order to validate this, locate somebody under the running motor car and accelerate to help them determine the origin of the hole. Once discovered, 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 GMC Sierra
The other possibility of being subjected to a muffled exhaust noise on GMC Sierra is to have a part of the exhaust device that has dislocated as a consequence of vibrations for example. In fact some junctions of the different parts of the pot can loosen after some time and cause 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 GMC Sierra to identify the issue region, and tighten or swap the bolts. If you hear a muffled sound but after checking it doesn’t seem to come from the pot itself, consider taking a look at this content which gives answers gives solutions about rear end noises on GMC Sierra.
Metal rattling exhaust sound GMC Sierra
Damaged exhaust muffler noise GMC Sierra
If, alternatively, you are subject to an exhaust sound that is more of a metallic sort of, it is possible that one or more parts of your exhaust may be injured. Indeed, it is conceivable that either your baffles, the catalyst or the silencer are the cause of this noise. To be sure, go under your GMC Sierra, cold, and tap each of the previously stated parts with a hammer to identify 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 GMC Sierra, you will either have to find a second hand one and do it yourself, or go to your auto technician.
Metal rattling exhaust noise GMC Sierra : Silentblock, loose pot
Finally, a metallic exhaust noise on your GMC Sierra may be in connection with a poor attachment of your exhaust to your car. In fact, over the years, vibrations, the pot fasteners on the car chassis can come off. In this case, you need to check, when cold, that the pot holds well, to try to get it to move in different directions and watch how it responds. Backwards there should be some play and be able to move but not too much. The closer you get to the engine, the more fixed it should be. Visually check 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.
