What causes the gurgling sound at idle in the 14th-generation Sylphy?

[StEliza]

There are many reasons for the gurgling sound at idle in the 14th-generation Sylphy. Excessive engine carbon deposits: When there is excessive carbon buildup inside the engine, the gasoline sprayed by the fuel injectors during startup can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture. Low ignition energy: When the internal engine temperature is insufficient, the fuel injectors spray more gasoline to meet power demands. The fuel requires higher ignition energy, and an increased spark plug gap can lead to reduced ignition energy, subsequently affecting performance. Abnormal coolant temperature: High engine coolant temperature can cause premature ignition timing, alter the air-fuel mixture ratio, and thin the engine oil viscosity (reducing lubrication). Causes of abnormal coolant temperature include insufficient coolant, a stuck thermostat, fan malfunction, or inaccurate temperature readings from the temperature control switch. Clogged fuel injectors: Clogged fuel injectors can result in inconsistent fuel spray quantities among the injectors, leading to uneven cylinder operation.