What causes the exhaust pipe to make a popping sound when the AC is on?
2 Answers
This situation may be caused by unstable idling and engine vibration due to the increased load on the engine after the compressor starts, leading to abnormal noise from the exhaust pipe. Here are the relevant details: 1. Car air conditioning: The car air conditioning system is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to an optimal state, providing a comfortable environment for passengers and reducing travel fatigue. It also creates good working conditions for the driver and plays an important role in ensuring safe driving. 2. Exhaust pipe: The exhaust pipe is part of the engine's exhaust system. The exhaust system mainly includes the exhaust manifold, exhaust pipe, and muffler. Usually, the three-way catalytic converter, which controls engine pollutant emissions, is also installed in the exhaust system. The exhaust pipe generally includes the front exhaust pipe and the rear exhaust pipe.
Recently, my car's exhaust pipe makes a loud 'puttering' noise when the AC is on, like it's hiccuping. This is usually because the AC startup increases the engine load, causing unstable engine RPM. It might be due to worn-out spark plugs leading to incomplete combustion, or gaps in the exhaust pipe amplifying the sound. Last time, I replaced the spark plugs myself and the noise stopped. If this continues, the heavy engine load might wear out components, so it's advisable to visit a repair shop to check the vacuum lines or air-fuel mixture ratio. If the noise gets too loud while driving, turn off the AC and pull over to avoid affecting driving safety. Regular maintenance of the ignition system is key to prevention.
