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奔驰轿车发动机怠速不稳故障检修!

来源:http://www.sdrunao.com/ 发布时间:2020-03-27   发布人:admin
  一辆奔驰轿车,用户反映该车发动机怠速不稳定,存在明显抖动现象;加速时反应慢,排气管有爆破现象;仪表板上的发动机故障警示灯点亮;三组分催化反应器燃烧红色后,车辆已运行了很长一段时间的高速。
  A Mercedes Benz car, the user reported that the engine idle speed of the car is unstable, there is obvious shaking phenomenon; the reaction is slow when accelerating, the exhaust pipe has blasting phenomenon; the engine fault warning light on the instrument panel is on; after the three-component catalytic reactor burns red, the car has been running for a long time at high speed.
  连接故障诊断仪对发动机电控系统进行检查,设备显示混合气过浓。
  Connect the fault diagnosis instrument to check the electronic control system of the engine. The equipment shows that the mixture is too rich.
  造成发动机混合气过浓的主要原因有进气过少、喷油过多和点火系统失火。
  The main causes of the engine rich mixture are too little intake air, too much fuel injection and misfire of ignition system.
  维修人员首先测量了燃油系统的压力,但油压是正常的。
  The maintenance personnel first measured the pressure of the fuel system, but the oil pressure was normal.
  根据车辆的年龄和症状,修理工怀疑是点火系统出了问题。
  Depending on the age and symptoms of the vehicle, the mechanic suspects that there is a problem with the ignition system.
  为此,维修人员取下火花塞进行检查。检查右侧火花塞时,无异常,高压跳动情况正常。当取下左侧火花塞进行检查时,发现火花塞电极之间积炭过多。
  For this purpose, the maintenance personnel remove the spark plug for inspection. When checking the right spark plug, there is no abnormality, and the high-pressure jump is normal. When the left spark plug was removed for inspection, it was found that there was too much carbon between the spark plug electrodes.
  通过对点火系统的检查,可以判断左点火系统存在故障。
  By checking the ignition system, it can be judged that there is a fault in the left ignition system.
  该车配备了两个独立的点火系统,即左侧和右侧的独立点火机构,由发动机控制单元直接控制。
  The vehicle is equipped with two independent ignition systems, i.e. left and right independent ignition mechanisms, which are directly controlled by the engine control unit.
济南奔驰汽车维修
  由于这个原因,维修人员首先对点火器进行了左右开关,但故障依然存在,然后对点火线圈进行了开关。此时,右侧高压火花变弱,左侧高压火花变强,说明左侧点火系统存在故障。
  For this reason, the maintenance personnel first switch the igniter left and right, but the fault still exists, and then switch the ignition coil. At this time, the high-pressure spark on the right side becomes weak and the high-pressure spark on the left side becomes strong, indicating that the ignition system on the left side is faulty.
  更换左点火线圈后,故障消除。
  After replacing the left ignition coil, the fault is eliminated.
  结论:该车的故障是由于左侧点火线圈损坏,导致点火线圈输出二次电压降。
  Conclusion: the failure of the car is due to the damage of the left ignition coil, resulting in the secondary voltage drop of the ignition coil output.
  测量后,点火线圈的电阻与新线圈的电阻相同。
  After measurement, the resistance of ignition coil is the same as that of new coil.
  当左边的点火线圈匝间击穿后出现故障,使左侧油缸在工作中击穿电压不足,导致未燃烧混合物进入排气管,当氧传感器来检测后的混合物太厚,照亮了引擎故障警告灯,导致排气管烧红三元催化反应器。
  When the ignition coil on the left fails after turn to turn breakdown, the breakdown voltage of the left oil cylinder is insufficient during operation, resulting in the unburned mixture entering the exhaust pipe. When the mixture detected by the oxygen sensor is too thick, the engine failure warning lamp is illuminated, resulting in the exhaust pipe burning the three-way catalytic reactor.
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