The second generation Fit sometimes ignites at 2000 rpm after cleaning the throttle.

1, the spark plug is not working well; 2. The vacuum tube leaks; 3, high-voltage line leakage; 4. The 4.PCV valve is blocked; 5. The throttle position sensor is faulty; 6, stepper motor idling fault; 7, idle speed control valve failure; 8. Abnormal throttle opening; 9. Air leakage in the air intake system. .

The normal working engine should be able to run evenly in the speed range of 300-500 rpm. If the lowest stable speed of the engine exceeds this speed range, or the engine flameout and unstable speed occur within this speed range, there is no idle speed or poor idle speed. When the idle speed is poor, it can be divided into idle flameout, unstable idle speed and excessive idle speed according to its fault characteristics.

If the engine runs well from low speed to high speed after starting, but turns off immediately after releasing the accelerator pedal, or turns off after unstable operation, it belongs to idle flameout fault. If the engine is not running smoothly at idle speed, the exhaust pipe makes a "chug chug" sound, which is generally a fault of unstable idle speed. If the lowest stable speed of the engine is higher than the specified range, and the speed cannot be reduced, it is considered that the idle speed is too high or there is no idle speed fault.