What Causes Abnormal Noise from the Exhaust Pipe?
3 Answers
Abnormal noise from the exhaust pipe can be caused by the following reasons: 1. Exhaust pipe aging: Caused by the aging of the exhaust pipe, which requires re-fixing or replacing the exhaust pipe. 2. Three-way catalytic converter failure: If the car's three-way catalytic converter fails, it cannot properly purify exhaust gases, leading to blockages and compression inside, resulting in abnormal noise from the exhaust pipe. In this case, it is necessary to visit a repair shop or 4S store for professional inspection and repair. 3. Car ignition system failure: If the car's ignition system fails, fuel cannot burn normally in the cylinders, leading to symptoms such as weak acceleration, easy stalling, and abnormal noise from the exhaust pipe. In this situation, a detailed inspection of the car's ignition system is also required.
My car also had the issue of the exhaust pipe making a puffing sound before, and it turned out to be due to the aging and deformation of the exhaust pipe gasket. Over time, rubber gaskets can harden and crack, causing poor sealing at the exhaust pipe connections, which results in a fart-like noise when the exhaust pressure increases. I specifically asked a mechanic about this, and he said this problem is particularly common in older cars, especially those that frequently drive on rough roads. Besides gasket issues, a broken exhaust pipe hanger can also cause the pipe to swing around and hit the chassis, producing a clanging metal sound. Actually, replacing the gasket set only costs a few dozen dollars, and addressing it early can prevent the exhaust pipe from deforming or cracking.
Last week when starting the car in the garage, I suddenly heard a rattling noise coming from the rear. Upon bending down to inspect, I discovered there was an issue inside the muffler. Now I understand that exhaust pipe noises mainly fall into three common scenarios: The first is the clicking sound caused by metal expanding and contracting with heat, which is particularly noticeable when starting a cold engine. The second is exhaust pipe perforation and gas leakage, often occurring where the pipe bends and rusts through, creating small holes that produce a bubbling sound at high speeds. The third is the muffler problem I encountered, where internal baffles come loose from welding and start swinging around. I remember a friend's car once suddenly emitting white smoke from the rear while driving, which was caused by perforation allowing exhaust to spray directly onto the chassis.
