Judgment and handling of common automobile faults

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Judgment and handling of common automobile faults

01

The steering wheel swings badly on good roads

Fault determination: a true fault.

Reason analysis: generally due to the brake drum and the hub connection bolt loose, the hub bearing hole and the brake drum boring off the center, so that the brake drum thickness is different, resulting in uneven measurement. Because, in the case of high speed, the wheel speed is very fast, the torque of the steering wheel swing mainly comes from the brake drum and the hub rotation uniformity and the balance, under the action of uneven measurement, inertia and forward Angle produce the torque of the steering wheel swing.

02

The fault light is on, and the vehicle engine shakes seriously

Fault determination: false fault.

Reason analysis: some new cars will have this situation, the vehicle engine jitter is serious, sometimes the fault indicator light will occasionally shine. Many people suspect that the quality problem is the vehicle, but the real reason is that the unclean fuel causes the pollution or blockage of the oil supply system. At present some advanced vehicles equipped with exhaust emissions monitoring system, because the control system can be very sensitive to detect vehicle emissions and fuel cleaning, so the use of unclean fuel will cause fuel supply, ignition, emission system pollution, which lead to engine failure indicator light and different degrees of engine jitter. So the effective solution is to thoroughly clean the contaminated system, continuously add gasoline with stable performance and add quantitative oil cleaner, the situation can be improved.

03

The engine throttle body and idle motor are dirty

Fault determination: a true fault.

Reason analysis: At present, the engine idle speed of the car is controlled by installing on the throttle body and the idle step motor. When the engine is running, due to the air quality and gasoline quality, will cause the engine throttle valve and idle valve have a lot of dirt, when the dirt is serious, the engine will be too low idle, poor stability or no idle, refueling throttle card phenomenon. Therefore, the car is generally driving every 20000km, it is recommended to clean the throttle body. After cleaning, the engine shall be set by the diagnostic instrument.

04

Black smoke comes from the exhaust pipe when the vehicle is driving at high speed

Fault determination: a true fault.

Reason analysis: under normal circumstances, the vehicle in the high speed smoke