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Why Can't the Idle Speed of 1800 RPM Be Reduced?

1 Answers
TessaAnn
07/29/25 4:42pm
The reason why the idle speed of 1800 RPM cannot be reduced is excessive carbon deposits in the throttle valve, intake manifold, intake valves, and combustion chamber. Excessive Carbon Deposits: Due to excessive carbon deposits and dirt in the intake manifold, the cross-sectional area of the air passage changes, making it impossible for the control unit to precisely control the idle air intake. This results in an overly rich or lean air-fuel mixture, causing abnormal combustion or engine shaking after startup, and even failure to start. High Idle Speed: When the idle speed exceeds the set RPM, the ECU commands the idle control valve to reduce the intake bypass, decreasing the air intake and lowering the engine speed. Issues such as sticking of the idle control valve due to oil sludge and carbon deposits or incomplete closing of the throttle valve can prevent the ECU from correctly adjusting the engine's idle speed, leading to unstable idling.
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Solutions for a non-functioning car key lock button are as follows: 1. Use the mechanical key: If the lock button on your remote key fails, you can use the mechanical key instead. Open the switch on the car key to retrieve the hidden mechanical key and lock the car door with it. 2. Use a spare key: The lock button may not work due to a malfunction. In this case, switch to a spare key and take the faulty key to a 4S shop for repair. 3. Replace the battery: The lock button might not function if the key's battery is dead. Visit a 4S shop to replace the key battery. 4. Change the parking spot: Strong signal interference nearby could cause the lock button to fail. Move your car to another parking spot and try locking it again.
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What are the differences between domestic car engines and joint venture engines?

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