What Causes Abnormal Noise in the Exhaust Pipe?
2 Answers
The causes of abnormal noise in the exhaust pipe are: 1. The mixture concentration is too high, and the unignited mixture enters the exhaust pipe and encounters fresh air, causing backfire; 2. Poor valve sealing, resulting in incomplete combustion; 3. Some exhaust valves are eroded or have poor sealing; 4. Carbon deposits at the contact surfaces between some intake and exhaust valves and their seats; 5. Some valve lifters have no clearance, or the two idle holes of the dual-barrel carburetor are unevenly adjusted or clogged; 6. The exhaust pipe is damaged, unable to muffle noise or purify exhaust. The maintenance methods for the exhaust pipe are: 1. Avoid water entering the muffler when driving in the rain or washing the car; 2. Regularly clean the dirt inside the exhaust pipe.
I often help people repair cars, and most exhaust pipe noises are caused by loose connections or cracks leading to air leaks. Over time, the exhaust pipe material can corrode due to heat and develop holes, especially at joints or bends. Another common issue is loose mounting brackets, which cause excessive vibration and rattling noises when driving. Additionally, internal rust or foreign objects stuck in the muffler can create a whooshing sound. If the exhaust pipe leaks, engine exhaust gases escape, not only creating annoying noise but also potentially affecting power output and fuel consumption. To diagnose, first listen for the source of the noise: open the hood while idling and lightly press the accelerator while someone helps locate the sound. Simple fixes include tightening bolts or replacing gaskets, but it's best to visit a professional shop to check for leaks that could harm the car. For regular maintenance, remember to rinse the undercarriage to reduce corrosion risks, especially when driving in rainy areas.
