The speed hand rotates randomly, and occasionally it doesn t catch fire, what s going on?

Hello landlord! Upshifts will break into a car with many possibilities. Consider it to be a used car.

It may be caused by poor drivetrain work. The engine power is poor and the output is unstable; There is slippage in the clutch; There is clearance in the transmission gears, the failure of the first and second gear synchronizers, and the clearance on the rear axle (differential, half-shaft spline, etc.). In addition to the problems of the car itself, the timing of gear shifts will also cause the car to break through the car with both gears and gears.

This depends on long-term experience. Generally, this kind of mini car is designed to have a dense gear ratio of the first and second gears, which means that the basic car will almost change the second gear as soon as it walks (this car should not have a speed meter, but it doesn't matter, judge the speed by listening to the sound of the engine, and slowly you will.) In fact, the master rarely looks at the rpm meter when driving), when necessary, you can clutch and shift gears with two feet, so that the car will drive more smoothly.

This is the poor internal contact of the instrument, and it really can't be done, so I have to change the instrument assembly.

It is difficult to start the hot car, first of all, it is excluded that the starting system is working normally. Check whether there is an engine fault lamp, read whether there is an engine fault code, check whether the ignition system (ignition coil, high-voltage wire, spark plug and plug connector, etc.) is faulty, and check whether the supply system (oil pump, oil circuit, fuel injector, throttle, etc.) is faulty.

The car is more worn. Look at the tires. The appearance is not very bad and repaired. Otherwise, sell it to someone else.

Summary. The car can't be hit, and the tachometer pointer doesn't move when the ignition is because 1It may be that the speedometer of the vehicle's instrument assembly is malfunctioning, causing the pointer of this gauge to not turn.

2.It may be that the vehicle's wheel speed sensor is malfunctioning, causing the watch to stop turning. 3.

It may be that the vehicle's mileage sensor is malfunctioning, causing the watch to not turn.

The car can't hit, and the tachometer pointer doesn't move when the ignition is fired.

The car can't be hit, and the tachometer pointer doesn't move when the ignition is because 1It may be that the speedometer of the vehicle's instrument assembly is malfunctioning, causing the pointer of this gauge to not turn. 2.

It may be that the vehicle's wheel speed sensor is malfunctioning, causing the watch to stop turning. 3.It may be that the vehicle's mileage sensor is malfunctioning, causing the watch to not turn.

Causes and solutions of car failure: 1. The ignition difficulty caused by carbon deposition in the car is accompanied by a slight shaking at idle. The solution is to clean the throttle, air inlet and nozzle carbon deposition can solve the problem 2, the ignition energy of the spark plug is weak, which will lead to a decrease in the ignition energy of the spark plug, and in severe cases, it will lead to a fire.

At present, most of the engines of many models are direct injection in the cylinder, so the requirements for spark plugs are relatively high. The workaround is to replace the spark plugs.

At the beginning, you can still drive more than 50 kilometers, after 20km, you can turn off the ignition normally, and after driving more than 20 km, you can't hit it again, and you can do it again the next day, and then I don't dare to drive, and now I can't hit it after stopping for more than ten days.

To check the spark plug spark plug problem, you can replace the spark plug and coil completely.

There are no sparks in the spark plugs.

That's because of the spark plug, you can replace it.

I haven't changed it.

The fire coil has not been replaced.