What Causes Exhaust Pipe Noise When Accelerating?
2 Answers
Here are the specific reasons for exhaust pipe noise when accelerating: 1. Damaged muffler or exhaust pipe: Symptoms include hearing abnormal noises from the exhaust pipe when pressing the accelerator pedal. The sound may not be very loud, and the car may drive normally, but fuel consumption increases. Sometimes, the noise may also come from the front section. 2. Aged heat shield: Symptoms include abnormal noises 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 an aged heat shield, and replacing it can solve the problem. 3. Damaged exhaust pipe: Symptoms include abnormal noises when turning or moving forward, often originating from the front wheel drive shaft with a damaged joint.
I've experienced a rattling noise from the exhaust pipe when accelerating before, and loose exhaust pipes are the most common cause. Things like rusted and broken mounting screws or aged rubber hangers can make the exhaust pipe wobble, resulting in metal clanging sounds when you step on the gas. It could also be due to a cracked or leaking exhaust pipe, especially when the bends rust through, causing high-pressure airflow to produce a whistling noise. If the ceramic inside the catalytic converter breaks apart, it can create a clattering sound during hard acceleration, resembling rolling pebbles. Last time my car had this issue, I found that the exhaust pipe gasket was burnt through—replacing it for 200 bucks made everything quiet again. It's best not to ignore it; aside from the annoying noise, it's dangerous if the exhaust pipe actually falls off and scrapes the ground.
