What causes the idle speed of Kia K2 to fluctuate?

[GabrielDella]

Here are the reasons for the fluctuating idle speed in Kia K2: 1. The main reason is excessive carbon buildup in the throttle body, which restricts air intake, requiring a throttle body cleaning at a repair shop. 2. Poor atomization of the fuel injectors in the fuel supply system leads to incomplete combustion, necessitating an inspection of the electronic fuel injection system. Below is the procedure for cleaning the automotive fuel system: 1. Open the fuel tank cap, remove the filter screen, and use a hose to extract most of the fuel from the tank, leaving about 10-15 cm of fuel. Add 80ml of ethanol gasoline replacement cleaner, reinstall the filter screen, and close the fuel tank cap. 2. Disconnect the engine's fuel inlet and return lines, and connect them to the corresponding lines of the no-disassembly cleaning machine using dedicated adapters to form a loop. 3. Based on the scale of the no-disassembly cleaning machine's reservoir or the number of engine cylinders (100ml of gasoline per cylinder), add gasoline to the cleaner's reservoir along with 100ml of ethanol gasoline replacement cleaner. 4. Adjust the pressure according to the vehicle type; carburetor vehicles require appropriate pressure adjustment, while fuel-injected vehicles need 2-3 pressure adjustments. 5. Start the engine, check for fuel leaks in the inlet and return lines, and clean at idle for 15-20 minutes, revving the engine every 3-5 minutes to expel carbon deposits and moisture through the exhaust pipe. 6. Disconnect the no-disassembly cleaning machine from the engine's fuel inlet and return lines, restore the vehicle's fuel system, and check for fuel leaks after starting the engine.