Qi Jun's tachometer went up and down, so he couldn't put it into gear after parking.

Does the subject want to ask, "What is the reason why Qi Jun's tachometer goes up and down and doesn't hang after parking?" Charging circuit failure, throttle failure.

1, charging line failure. It may be the cause of generator failure, battery voltage sensor failure and loose battery pile head.

2. The throttle is out of order. The throttle position sensor detects the opening of the throttle valve, thus controlling the fuel injection quantity. The function of the throttle control motor is to open the throttle at a certain angle according to the depth of the throttle. When these two components fail, the air intake of the engine will change, causing the tachometer to fluctuate up and down when the vehicle is driving.