What Causes Abnormal Noise from the Exhaust Pipe at Idle Speed?

[StTucker]

The reasons for abnormal noise from the exhaust pipe at idle speed are as follows: 1. Damage to the muffler and exhaust pipe: Symptoms include hearing abnormal noise from the exhaust pipe when pressing the accelerator pedal. The noise may not be very loud, and the car may drive normally, but fuel consumption increases. Sometimes, noise may also come from the front section. 2. Aging of the heat shield: Symptoms include abnormal noise from under the engine during low-speed driving or when accelerating, especially in colder weather. It is recommended to lift the car and check if there is a heat shield between the exhaust pipe and the ground. The noise may be caused by the aging of the heat shield, and replacing it can solve the problem. 3. Damage to the exhaust pipe: Symptoms include abnormal noise when turning or moving forward, often originating from the damaged front wheel drive shaft joint.