故障现象：一辆现代索纳塔（ＳＯＮＡＴＡ）四缸２．０Ｌ轿车，发动机冷车不易着火，有时起动三四次才能着火；着火后，冷车怠速较稳，随着水温逐步上升，发动机出现抖动，排气管发出“突、突”声；行车时，加速无力，勉强加速到８０ｋｍ／ｈ－９０ｋｍ／ｈ时，车身出现后坐现象，类似于高速断火的征兆，低速时，这种现象不太明显，用废气分析仪检查，ＣＯ为０．２％－０．３％，但ＨＣ排放高达１８００ｐｐｍ。
    故障排除：利用现代专用检测仪进行检测，结果无任何故障代码输出。根据高速的故障征兆，怀疑是点火系统的故障，于是对点火系统进行全面检查。该车采用无分电器点火（ＤＬＩ）系统，点火系统由点火模块、点火线圈、高压线、火花塞及电控单元（ＥＣＭ）等组成，按照先易后难的排障原则，首先用数字万用表测量了高压线及点火线圈的电阻值，都在正常范围之内；接着卸下４只火花塞，检查电极间隙，在１．０ｍｍ－１．１ｍｍ，属于正常值；在火花塞试验台上观察其跳火状况，基本正常，观察其外表，也未发现明显缺陷（注意：现代轿车是直接点火系统，不要采用传统的调火的方法进行点火强度试验，这样容易反向击穿点火器，曾发现过类似的现象）；在发动机正常温度下，用手摸点火线圈外壳，不感到烫手；发动机冷车怠速和低速运转都较为平稳，故点火模块问题不会大。据此，果断地排除了点火系统存在故障的可能性，并着重对供油系统进行检查。
    首先测量燃油压力和燃油流量，分别为３２０ｋＰａ和１．５Ｌ／ｍｉｎ，属于正常范围，再逐缸进行断油试验，拔掉喷油器电源线，接上１２Ｖ试灯，当断至第２缸和第３缸时，发动机转速并没有明显下降，且试灯闪烁正常，说明第２、第３两缸工作不良。因此推断，第２缸和第３缸喷油器处于堵塞状态。清洗后装车试验，无效果，于是换上两只新喷油器。此后，冷车起动迅速，热车工作平稳，加速有力，发冲和后坐现象消失，尾气排放ψ（ＨＣ）下降至１５０ｘ１０－６，发动机工作恢复正常。
    建议：鉴于上述情况，建议用户在汽车每行驶２万公里以后，送往有条件的修理厂用发动机不解体清洗机对供油系统进行情洗，或者拆下喷油器用专用清洗设备对其进行清洗，消除积碳，以保证喷油器正常工作，这样才能确保发动机的动力性、经济性和排放净化性

好，专业。

好文章，十分专业，是汽车发动机专业的吧？以后有机会多些几篇，让我们扫扫盲入入门。

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顶一百次也不够！！！！！！！！！！！！！！！！！！！！！！！！

好文章！能学到东西！

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