Can the idle motor be adjusted?

The principle of engine idle speed control is as follows. Because the throttle valve plate is completely closed at idle, there is an air passage near the throttle to provide engine ventilation at idle. The idle motor controls the air intake when the engine is idle by adjusting the air flow of the bypass passage, and then controls the idle speed.

Why use passive motors instead of ordinary motors? Because the idling motor is an accelerating motor, its action is controlled by pulse signals, and the rotation angle corresponding to each pulse signal can be accurately controlled by the operating computer. Adjusting the idle speed of the motor is a professional technology, and it is not recommended for the operator to adjust it by himself.

It is recommended that the operator go to a professional repair shop or 4S shop to find a professional maintenance technician. Adjusting the idle motor requires adjusting the screw of the idle motor. All engines use electronic throttles. Compared with wire control, electronic throttle can control the amount of air entering the engine more accurately.

When the engine is running, the throttle valve is completely closed, so there is a bypass pipe near the throttle valve to bleed air. The idle motor controls the airflow of the bypass pipe, and the idle motor is a stepping motor, which is controlled by a pulse signal. Each pulse signal has a corresponding rotation angle, so the ecu of this car can accurately control the amount of air entering the engine at idle speed.

There is a threaded screw in front of the idler motor. This device can convert the rotary motion of the motor into forward and backward telescopic motion. It is necessary to adjust the lead screw when adjusting the idling speed of the motor. Idler motor is an important part of wire-controlled traction, and the idle speed of the engine is in the bypass of cable valve.

When the car is in working condition, the throttle valve plate is closed, and the air intake of the car enters through the bypass. The conical valve stem of the high-speed idling motor is connected with the rotor through a threaded mechanism. According to the principle of engine idle speed control, if we want to adjust the engine idle speed, we only need to adjust the air intake of the throttle bypass and the axial position of the conical valve head.

Engine idling, engine idling control adopts closed-loop mode, that is, ECU opens the bypass pipe to a set opening according to factors such as water temperature and whether the air conditioner is turned on. When the engine is no longer running, the bypass pipe will be closed and the engine speed will be controlled by the throttle opening.

Contemporary automobile engines rarely use bypass air to control idle speed, but directly use sound to control idle speed. When idling, the throttle opening is small to meet the demand of idling ventilation. The main difference between bypass ventilation and direct throttle valve is that the opening of bypass ventilation can be changed artificially and there are special adjusting screws.

Most buses are old-fashioned. These models use a bypass idle valve, and the opening of the idle valve is increased, thus increasing the idle speed, so that it is not easy to get stuck. The idle opening of the automatic throttle is completely controlled by the stepping motor, and it will only open at a certain angle according to the setting of ECU.

When there is carbon deposit on the throttle, the idle opening will become larger, but the clearance will remain unchanged. When idling, the engine speed is low, and the engine idling is low, indicating that the engine intake is insufficient at idling. Cause: A large amount of carbon deposits block the intake pipe. Hot car and high idle speed indicate that the engine air level is too high. Cause: The idle motor controls the air intake incorrectly.

If it is too high, it is not excluded that the throat butterfly valve is too dirty and cannot be closed tightly, which may lead to air leakage. When cleaning the throttle valve under the condition of unstable engine idle speed, it must be disassembled to clean the idle motor and bypass, and it cannot be cleaned at will. Therefore, it is deceptive to say that the carburetor of our carburetor can be repaired 20 years ago, but it can hardly be repaired now.