What Causes the Hissing Sound Under the Car After Starting?
2 Answers
Start the car after the chassis has a leak sound reason is: exhaust pipe, muffler interface parts leakage, replacement can be solved. The role of the chassis is: 1, support, install the car engine and its various components assembly, forming the overall shape of the car, and receive the power of the engine; 2, make the car move, ensure normal driving. The composition of the car chassis is divided into: 1, transmission system: refers to the power transmission device between the engine and the drive wheel; 2, driving system: consists of the frame, wheels, suspension components; 3, steering system: used to change or maintain the car driving or reversing direction of the device.
In my many years of repairing cars, I've encountered numerous issues with air leakage sounds from the chassis. The most common is exhaust system failure, such as aging exhaust pipes with cracks or loose connections. When starting the engine, exhaust gas leaks, sounding like a hissing jet. Another possible cause is the air brake system, especially in some trucks or SUVs, where leaks in the air tanks or pipelines can cause a hissing sound. There's also the air suspension system; if the vehicle is equipped with it, a damaged airbag can lead to similar noises. I recommend stopping the car immediately for inspection and not continuing to drive, as air leakage may involve the risk of toxic gases or brake failure. Pay more attention to these components during regular maintenance, and periodic cleaning and anti-corrosion can extend their lifespan, reducing sudden failures. In short, safety comes first—get it checked by a professional shop as soon as possible.
