What Causes the Slight Fluctuation of the Needle During Car Idling?
1 Answers
The slight fluctuation of the needle during car idling is caused by: 1. Oil stains or carbon deposits on the throttle valve, oil stains or carbon deposits around the intake tract of the throttle valve, oil stains or carbon deposits on the idle stepper motor, duty cycle solenoid valve, or rotary solenoid valve; 2. Damage or sticking of the throttle valve motor, idle stepper motor, duty cycle solenoid valve, or rotary solenoid valve; 3. Faults in the air flow meter or its circuit, faults in the intake pressure sensor or its circuit, poor contact due to water ingress in the engine control unit connector, or internal faults in the computer. The solution to the slight fluctuation of the needle during car idling is to clean the intake pipe and fuel injector to ensure smooth fuel injection, thorough engine combustion, and stable operation.