2 1 automatic BYD song max idling is unstable.

2 1 automatic BYD song max idling is unstable. It is recommended to check the tire pressure of the car. General tire pressure problems may lead to this phenomenon.

Engine idling instability is mainly caused by the following aspects:

First, the air intake system is faulty.

1. Air, gasoline vapor and combustion waste gas that should not enter the intake manifold or various valves leak into the intake manifold, causing the mixture to be too rich or too lean, which makes the engine burn abnormally.

2. The common phenomena of excessive scaling of throttle and air inlet are: the throttle has oil pollution or carbon deposition; There are oil stains and carbon deposits at the air inlet around the throttle; Idle stepper motor, duty solenoid valve and rotary solenoid valve are polluted by oil and carbon.

3. Idle air actuator failure Idle air actuator failure leads to inaccurate idle air control. Common reasons are: the throttle motor is damaged or the card is issued; Idle stepper motor, duty solenoid valve and rotary solenoid valve are damaged or stuck.

4. Common phenomena of inaccurate air intake include: failure of air flowmeter or its line; Intake pressure sensor or its line fault; The plug of the engine control unit is due to poor water contact or internal computer failure.