The throttle sensor voltage is unstable.

Judging from the engine speed, the estimated speed is also relatively low, indicating that the signal of the throttle sensor is abnormal, and the electronic control unit can't control the oil supply normally, resulting in the engine speed not going up. First, check whether the wiring between the sensor and the connector is in poor contact, and whether the contact head of the connector is rusty or dusty. Poor contact will increase resistance and lead to voltage drop.

The rotating shaft of the resistor is connected with the throttle valve, and it has two contacts.

Fully open contact and no-load contact. When the throttle valve is in the idle position, the idle contact is closed and the idle working condition signal is output to the computer; When the throttle valve is in other positions, the idle contact is opened, and voltage signals with different angles relative to the throttle valve are output, and the computer identifies the engine load according to the signal voltage value; According to the change rate of signal voltage in a certain period of time, whether it is an acceleration state or a deceleration state is identified. According to these working conditions, the computer corrects the fuel injection quantity or controls the fuel cut-off.