奔馳最容易出現的故障

The most common malfunctions of Mercedes Benz

　　一、四輪定位失準 癥狀：四輪定位值失準后，車輛在轉彎時會覺得方向沉重，回正性不好，輪胎會出現偏磨現象。根據維修統計奔馳W140底盤的轎車一般行駛60000至70000公里左右時，由于下懸掛膠套損壞導致定位值失準的較多。 解決：出現以上故障現象時，必須及時到修理廠更換懸掛膠套，進行四輪定位調整。

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 癥狀：火花塞性能變差后，當您在駕車行駛時會感覺到發動機動力不足、急加速嘬車并伴隨排氣管發出“突、突”聲，怠速時發動機抖動等現象。 解決：建議每行駛3萬公里到修理廠檢查火花塞，必要時更換

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、節氣門體臟污 癥狀：奔馳W140轎車的節氣門在行駛20000公里左右時，由于空氣質量原因，截流閥處會有許多污垢，當污垢積累到一定厚度時，發動機就會出現啟動時不易著車，著車后怠速異常，行駛中熄火等現象，此時節氣門就需要清洗了。 解決：清洗后通過原廠診斷儀設定可以達到標準。

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、噴油器臟污 癥狀：噴油器臟污后，發動機會出現起動困難、動力下降、加速遲緩、怠速發抖、冒黑煙、尾氣超標、嚴重時發動機將無法起動。 解決：進行免拆清洗噴油器，清洗的同時還可以把燃燒室和活塞頂部的積炭清洗掉。建議車輛每行駛20000公里進行一次免拆清洗。這樣也可以避免進氣系統積炭積存太厚。

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、轉向機漏油 癥狀：W140底盤的轎車轉向機修包損壞后，轉向機外部會有許多油污，使轉向助力油虧損。虧油嚴重的在轉向時會發出很大的噪音，如不及時修理將會使助力泵虧油損壞。 解決：發現轉向機漏油應及時到修理廠更換轉向機修包，以防轉向助力系統虧油造成元件損壞。一般W140底盤的轎車行駛10萬公里左右，轉向機出現漏油現象的比較多。

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、水泵損壞滲漏冷卻液 癥狀：W140轎車水泵出現滲漏冷卻液現象比較普遍。水泵損壞后使冷卻液泄漏，當冷卻液虧損嚴重時，會造成冷卻液溫度過高損壞發動機。 解決：發現水泵有滲漏冷卻液現象的應及時更換水泵，以免造成更大的損失。

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 癥狀：燃油泵是將燃油加壓輸送到噴油器。一般奔馳W140底盤的轎車燃油泵損壞之前會發出“吱、吱”聲，當燃油泵損壞后，燃油不能噴進發動機，發動機將停止工作。 解決：當燃油泵出現異響時，應及時更換燃油泵，以免愛車拋錨。

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、制動開關損壞 癥狀：W140裝有ASR系統的轎車，在制動開關損壞后會點亮ASR燈，有時行駛時不能加速。 解決：出現ASR燈點亮時，應到修理廠用診斷儀檢測。一般因制動開關引起ASR燈亮的比較多。

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、空氣流量計的故障 癥狀：噴射系統為ME的轎車，其發動機所吸入的空氣量是靠熱膜式空氣流量計來測量的。因其結構的原因空氣流量計特別容易損壞。損壞后，車輛出現加速無力、冒黑煙、無法跑到最高車速、沒有怠速等現象。 解決：建議視行車空氣狀況及時清潔或更換空濾。只有經常保持進入發動機的空氣含塵量少，才能使空氣流量計的壽命延長。

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、下擺臂球頭損壞 癥狀：W140底盤的轎車下擺臂球頭損壞后，將直接影響愛車的舒適性和安全性。如果您的愛車慢速行駛在顛簸路面時，方向盤上傳來“咯噔、咯噔”的異響聲，那么就有可能是下擺臂球頭損壞了。 解決：下擺臂球頭損壞需要及時更換，否則，在高速行駛中球頭與球窩脫節，會直接危及您的生命。

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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