What Causes the Gurgling Noise During Car Idling?

1 Answers
JosephineAnn
07/30/25 5:54am
Car idling gurgling noise has complex causes, involving components such as the throttle valve and starting claw. Below is a detailed explanation: 1. Incomplete combustion: During engine idling, the mixture of gasoline and air in the combustion chamber fails to burn completely, resulting in abnormal noise at the exhaust pipe. 2. Excessive carbon deposits: Prolonged idling leads to excessive carbon buildup on the engine throttle valve and intake manifold. The accumulation of dirt reduces the intake passage area, causing the vehicle's electronic control unit to inaccurately regulate the air intake. This results in either too rich or too lean a mixture, leading to abnormal engine vibration due to improper combustion. Consequently, internal engine components such as the starting claw, half-moon key, crankshaft pulley, gasket, and motor belt collide with each other, producing abnormal noises.
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