What if the overbearing 2700 idle speed is unstable?

The solution to the unstable idle speed of Pacific Auto Network beyond 2700 is to clean the oil circuit, check whether the idle motor has carbon deposit and should be cleaned. If you have cleaned the engine carbon deposit, washed the throttle, changed the oil pad and spark plug, etc. It is still found that the car body is shaking at idle speed. It is recommended to check the fuel supply pressure and intake pressure sensor at the 4S shop.

Engine idling instability is mainly due to the following reasons:

1. Leakage of intake manifold or various valves. When air, gasoline vapor and combustion waste gas that should not enter enter the intake manifold, the mixture is too rich or too thin, which makes the engine burn abnormally.

2. There are too many scales on the throttle and air inlet. Common phenomena are: the throttle has oil stains or carbon deposits; 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, which 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. Incorrect air intake. Common phenomena include: air flowmeter or its line failure; Intake pressure sensor or its line fault; The plug of the engine control unit is due to poor water contact or internal computer failure.

(Photo/Text/Photo: Pacific Auto Network Chen Hanlin)