What happened to the ignition switch of BMW 14 730?

It is very common for BMW's starting ignition device to fail, and the car we drive will inevitably fail for some reasons. But don't be too alarmed at this time, and deal with it in time. Let's share with you the failure of BMW's starting ignition device. There is something wrong with the starting ignition device of BMW. 1 The mixture is too rich: if the engine is difficult to start, but the accelerator pedal can still start normally after stepping on the bottom (there is no fuel injection after stepping on the bottom), it means that the mixture is too rich. At this point, you can remove the air cleaner element and release a part of the rich mixture accumulated at the air inlet. In addition, after the filter element is removed, the intake resistance becomes smaller, and the smaller the intake resistance, the thinner the mixture will be and it can be started normally. It is important to check whether the solenoid valve of the carbon canister is stuck in the open position. Too much carbon deposit in the throttle and bypass airway: it feels much heavier when stepping on the throttle for the first time every day, and the engine is difficult to start, but it can be started normally when stepping on it slightly, indicating that there is too much carbon deposit in the throttle, which blocks the throttle and makes it difficult to start. When you start, you can start normally by stepping on the accelerator slightly, so the air intake is guaranteed, but when you relax the accelerator, you will immediately turn off the engine. The throttle system and bypass air duct should be cleaned in time. After cleaning, they can be matched again to return to normal. ? Poor contact of the battery pole in cold weather: after a long time of use, the battery pole will produce white crystal particles, which will make the battery leak, and the engine will not start after parking in cold weather. After pouring the crystal particles on the club head with boiling water, it can be started normally. When repairing, use sandpaper to grind off the white crystal particles on the club head and apply grease to eliminate the fault. Short circuit of ignition coil: it will lead to the difficulty in starting the engine, weak acceleration, black smoke from the exhaust pipe and sharp increase in fuel consumption. Replacing the faulty ignition coil can eliminate the fault. The starting ignition device of BMW is broken. This situation may be due to the failure of the starting system, which makes the engine unable to rotate or slow down, so that the engine cannot be started. The failure of starting system may be caused by insufficient battery power, short circuit of main fuse, ignition switch failure and starter failure. The specific performance of the engine not starting is to turn on the ignition switch and turn the ignition switch to the starting position, but the engine does not start. In addition to the above-mentioned starting system failure, ignition system failure and fuel injection system and air intake system failure may also cause this problem. The common faults of ignition coil include poor working of ignition coil, igniter fault and incorrect ignition time. The causes of fuel injection system failure include insufficient fuel in fuel tank, non-working fuel pump, deformation of fuel pipe, disconnection of short-circuit relay, poor fuel pressure regulator and unclean fuel filter. The faults of air intake system may be idle speed control valve fault, air flow meter fault and throttle valve fault. ? What happened to the steering wheel fault light when BMW 5 Series started? When the cold car starts, especially when the weather temperature drops sharply, the fault light will light up because of the temperature correction problem when the computer starts, but it will not light up as long as the temperature rises to a certain extent and stabilizes. The aging of equipment leads to abnormal vehicle operation, resulting in poor combustion and ignition, and some sensors themselves cannot be turned on. The fault light of the steering wheel sign indicates that there is something wrong with the steering assist system of the car. The reason why the steering wheel fault light is on may be that the power steering system contains a lot of air, which leads to abnormal steering of the car; Or the flow control valve of the steering pump is stuck due to foreign matter in the steering hydraulic pipeline. When the yellow light is on, it means that the steering system has partially failed, and more force is needed to turn the steering wheel at this time; If the red light is on, the steering system is completely out of order. At this time, the power-assisted system will not provide any power-assisted effect, and the power to turn the steering wheel is provided by both hands. Cause of the steering wheel light: 1, generator failure. Unstable power supply will cause the steering wheel light to light up. 2. The connection of the steering assist system is loose, resulting in partial steering fluid leakage. 3, booster pump failure. Damage to the booster pump will also cause the steering wheel light to light up. 4. The steering system contains air, resulting in abnormal steering. 5. The steering gear piston cylinder is mechanically damaged, the sealing performance of the oil seal is reduced, and the control valve is damaged. 6. There is a foreign body in the steering hydraulic pipeline, which causes the flow control valve of the steering pump to be stuck. Solution: 1 Check whether the generator, booster pump, steering gear and other mechanisms are in a damaged state. 2. Check whether the connection parts of all parts are loose. 3. Check whether the tire pressure is normal. 4. Replace the power steering pump, steering gear and other parts. BMW's ignition failed to start. 3 BMW can't catch fire with electricity. Why can't the car engine catch fire, but the instrument is still on? The common main reasons are as follows. 1, battery loss After the battery of the vehicle loses power, it will also cause the vehicle to fail to start, but the instrument can be lit. Sometimes the battery works well, but suddenly it may not start. The life of a battery is generally about 5 years. 2. Starter system failure, such as starter failure, starter electromagnetic switch damage, resulting in the starter can not drive the crankshaft wheel to work, or starter relay failure. It will also lead to the failure of the starter and the internal failure of the starter, which will make the vehicle unable to start. 3, ignition system failure, ignition system circuit damage, spark plug working badly, ignition coil failure, etc. , it will also cause the vehicle to be unable to drive. ? 4. Crankshaft position sensor failure When the crankshaft position sensor fails, the engine will not inject oil and ignite, and the engine will not start. 5, engine timing failure Engine timing is to control the working order of the engine camshaft and crankshaft, if there is a problem. The engine won't start. 6. Engine computer failure After the engine computer is damaged, the vehicle cannot be started. 7. Exhaust system failure, such as serious blockage of the three-way catalytic converter, causes the vehicle engine to fail to exhaust normally, and the engine fails to start or automatically shuts down after starting. 8. Vehicle anti-theft system failure When the vehicle key, body control unit and other related components fail, the vehicle cannot be started, or even the instrument cannot be lit? 9.CAN communication fault CAN communication network fault and circuit fault. Like a mouse biting a thread.