奔驰最容易出现的故障

The most common malfunctions of Mercedes Benz

　　一、四轮定位失准 症状：四轮定位值失准后，车辆在转弯时会觉得方向沉重，回正性不好，轮胎会出现偏磨现象。根据维修统计奔驰W140底盘的轿车一般行驶60000至70000公里左右时，由于下悬挂胶套损坏导致定位值失准的较多。 解决：出现以上故障现象时，必须及时到修理厂更换悬挂胶套，进行四轮定位调整。

1、 Symptoms of four-wheel alignment misalignment: After the four-wheel alignment values are misaligned, the vehicle may feel heavy in the direction and have poor centering when turning, resulting in tire wear. According to maintenance statistics, when driving a Mercedes Benz W140 chassis sedan for about 60000 to 70000 kilometers, there are more misalignment values due to damage to the lower suspension rubber sleeve. Solution: When the above faults occur, it is necessary to promptly go to the repair shop to replace the suspension rubber sleeve and adjust the four-wheel alignment.

　　二、火花塞不良 症状：火花塞性能变差后，当您在驾车行驶时会感觉到发动机动力不足、急加速嘬车并伴随排气管发出“突、突”声，怠速时发动机抖动等现象。 解决：建议每行驶3万公里到修理厂检查火花塞，必要时更换

2、 Symptoms of poor spark plug performance: After the performance of the spark plug deteriorates, you may feel insufficient engine power, rapid acceleration and sucking of the car, accompanied by a "popping" sound from the exhaust pipe, and engine shaking at idle while driving. Solution: It is recommended to check the spark plugs at the repair shop every 30000 kilometers and replace them if necessary

　　三、节气门体脏污 症状：奔驰W140轿车的节气门在行驶20000公里左右时，由于空气质量原因，截流阀处会有许多污垢，当污垢积累到一定厚度时，发动机就会出现启动时不易着车，着车后怠速异常，行驶中熄火等现象，此时节气门就需要清洗了。 解决：清洗后通过原厂诊断仪设定可以达到标准。

3、 Symptoms of dirty throttle body: When driving around 20000 kilometers on the Mercedes W140 sedan, due to air quality reasons, there will be a lot of dirt at the shut-off valve. When the dirt accumulates to a certain thickness, the engine will experience difficulties starting, abnormal idling after starting, and stalling while driving. At this time, the throttle needs to be cleaned. Solution: After cleaning, the standard can be achieved by setting the original diagnostic instrument.

　　四、喷油器脏污 症状：喷油器脏污后，发动机会出现起动困难、动力下降、加速迟缓、怠速发抖、冒黑烟、尾气超标、严重时发动机将无法起动。 解决：进行免拆清洗喷油器，清洗的同时还可以把燃烧室和活塞顶部的积炭清洗掉。建议车辆每行驶20000公里进行一次免拆清洗。这样也可以避免进气系统积炭积存太厚。

4、 Symptoms of fuel injector contamination: After the fuel injector is contaminated, the engine will experience difficulties starting, power loss, slow acceleration, shaking at idle, black smoke, excessive exhaust emissions, and in severe cases, the engine will not be able to start. Solution: Clean the fuel injector without disassembly, and at the same time, clean the carbon deposits on the combustion chamber and piston top. It is recommended that the vehicle be cleaned without disassembly every 20000 kilometers. This can also prevent excessive carbon buildup in the intake system.

　　五、转向机漏油 症状：W140底盘的轿车转向机修包损坏后，转向机外部会有许多油污，使转向助力油亏损。亏油严重的在转向时会发出很大的噪音，如不及时修理将会使助力泵亏油损坏。 解决：发现转向机漏油应及时到修理厂更换转向机修包，以防转向助力系统亏油造成元件损坏。一般W140底盘的轿车行驶10万公里左右，转向机出现漏油现象的比较多。

5、 Symptoms of steering gear oil leakage: After the W140 chassis car steering gear repair kit is damaged, there will be a lot of oil stains on the outside of the steering gear, causing a loss of power steering oil. Severe oil loss can cause loud noise during steering, and failure to repair it in a timely manner can result in oil loss and damage to the power pump. Solution: If oil leakage is found in the steering gear, it is necessary to promptly go to the repair shop to replace the steering gear repair kit, in order to prevent component damage caused by insufficient oil in the steering power system. A car with a W140 chassis typically experiences oil leakage in the steering gear after driving around 100000 kilometers.

　　六、水泵损坏渗漏冷却液 症状：W140轿车水泵出现渗漏冷却液现象比较普遍。水泵损坏后使冷却液泄漏，当冷却液亏损严重时，会造成冷却液温度过高损坏发动机。 解决：发现水泵有渗漏冷却液现象的应及时更换水泵，以免造成更大的损失。

6、 Symptoms of water pump damage and coolant leakage: It is common for W140 cars to experience coolant leakage from the water pump. After the water pump is damaged, the coolant leaks. When the coolant is severely depleted, it can cause the coolant temperature to be too high and damage the engine. Solution: If coolant leakage is found in the water pump, it should be replaced in a timely manner to avoid causing greater losses.

　　七、燃油泵的故障 症状：燃油泵是将燃油加压输送到喷油器。一般奔驰W140底盘的轿车燃油泵损坏之前会发出“吱、吱”声，当燃油泵损坏后，燃油不能喷进发动机，发动机将停止工作。 解决：当燃油泵出现异响时，应及时更换燃油泵，以免爱车抛锚。

7、 Symptoms of fuel pump malfunction: The fuel pump pressurizes and delivers fuel to the injector. Before the fuel pump of a typical Mercedes Benz W140 chassis is damaged, there will be a "squeak" sound. When the fuel pump is damaged, fuel cannot be injected into the engine, and the engine will stop working. Solution: When there is abnormal noise in the fuel pump, the fuel pump should be replaced in a timely manner to prevent the car from breaking down.

　　八、制动开关损坏 症状：W140装有ASR系统的轿车，在制动开关损坏后会点亮ASR灯，有时行驶时不能加速。 解决：出现ASR灯点亮时，应到修理厂用诊断仪检测。一般因制动开关引起ASR灯亮的比较多。

8、 Symptoms of brake switch damage: W140 sedans equipped with ASR system will light up the ASR light after the brake switch is damaged, sometimes unable to accelerate while driving. Solution: When the ASR light is on, it should be checked at the repair shop using a diagnostic tool. Generally, ASR lights are on more frequently due to the brake switch.

　　九、空气流量计的故障 症状：喷射系统为ME的轿车，其发动机所吸入的空气量是靠热膜式空气流量计来测量的。因其结构的原因空气流量计特别容易损坏。损坏后，车辆出现加速无力、冒黑烟、无法跑到最高车速、没有怠速等现象。 解决：建议视行车空气状况及时清洁或更换空滤。只有经常保持进入发动机的空气含尘量少，才能使空气流量计的寿命延长。

9、 Symptoms of malfunction of air flow meter: For sedans with ME injection system, the amount of air sucked in by the engine is measured by a hot film air flow meter. Due to its structure, air flow meters are particularly prone to damage. After damage, the vehicle experiences weak acceleration, black smoke, inability to reach the maximum speed, and no idling. Solution: It is recommended to clean or replace the air filter in a timely manner depending on the driving air condition. Only by regularly maintaining a low dust content in the air entering the engine can the lifespan of the air flow meter be extended.

　　十、下摆臂球头损坏 症状：W140底盘的轿车下摆臂球头损坏后，将直接影响爱车的舒适性和安全性。如果您的爱车慢速行驶在颠簸路面时，方向盘上传来“咯噔、咯噔”的异响声，那么就有可能是下摆臂球头损坏了。 解决：下摆臂球头损坏需要及时更换，否则，在高速行驶中球头与球窝脱节，会直接危及您的生命。

10、 Symptoms of damage to the lower arm ball joint: After the W140 chassis car's lower arm ball joint is damaged, it will directly affect the comfort and safety of the car. If your car is driving slowly on bumpy roads and the steering wheel emits a rattling sound, it is possible that the lower arm ball joint is damaged. Solution: If the lower arm ball joint is damaged, it needs to be replaced in a timely manner. Otherwise, during high-speed driving, the ball joint and socket will become detached, which will directly endanger your life.

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