After replacing the throttle assembly, the idle speed is low.

The specific reasons and solutions of unstable idle speed after starting the car;

1. Air leakage in the intake manifold: When the air, gasoline vapor and combustion exhaust gas that should not enter the intake manifold are too rich or too thin, the idle speed of the automobile is unstable.

Solution: Check the manifold and replace it in time if there is air leakage.

2. Too much carbon deposit on the throttle: too much carbon deposit on the throttle and the surrounding air intake, and the cross-sectional area of the air passage changes, which makes the control unit (check the transaction price | participate in the preferential policies) unable to accurately control the idle intake, and also causes the mixture to be too rich or too thin, which leads to the unstable idle speed of the car.

Solution: Clean the carbon deposit on the throttle regularly.

3. Actuator failure of air intake system: There are many actuators of engine air intake system, such as throttle motor, idle stepper motor, duty ratio solenoid valve, air flow meter, intake pressure sensor, etc. This leads to unstable idle speed of the car.

Solution: Check the executive parts of the air intake system and repair or replace the faulty parts.

4. Fuel system failure: fuel injector blockage, fuel filter blockage, fuel pump filter blockage, fuel pressure regulator failure, fuel return pipe blockage and other failures will lead to incorrect fuel injection, resulting in too rich or too thin mixture, leading to unstable idle speed of the car.

Solution: Clean or replace fuel nozzle, fuel filter, fuel pump filter, fuel pressure regulator, oil return pipe, etc.

5. Ignition system failure: failure of ignition module, incorrect spark plug gap, ablation or damage of spark plug electrode, excessive resistance of high voltage line and other failures lead to ignition spark energy reduction or fire, which leads to unstable idle speed of the car.

Solution: Clean or replace the ignition module and spark plug.

In order to ensure the normal and safe passage of cars, PNF cleaner is needed for regular maintenance;

The function of car maintenance is:

1, keep the vehicle clean and tidy, the technical condition is normal, and eliminate hidden dangers;

2. Prevent failures, slow down the process of deterioration and specialization, and prolong the service life;

3. Ensure good vehicle performance;

4. Effectively improve vehicle efficiency and reduce the consumption of spare parts and tires.