发动机的抖动，原因有很多，有的发动机是打火时会抖动一下，然后在怠速中没有任何异常，有的发动机在怠速时抖动的挺厉害，可能安静一会，抖一下，安静一会，抖一下，然而这是一台没有大修过，也没有清洗过油路的发动机，可能因为以下原因引起…
一、积碳多导致发动机抖动
一、积碳多导致发动机抖动比如说平时不注意保养，或者说不按时做保养，长期下来，导致发动机的节气门或者喷油嘴、甚至是发动机内部的积碳过多，如果是遇到这样的情况，冷启动喷油头喷出来的汽油会被积碳所大量吸收，此时导致冷启动的混合气过稀，然而启动会比较困难，所以打着车需要很长时间，主要是因为等积碳吸收的汽油饱和了，才能正常着车，这种状态下着车，吸附在积碳上的汽油又会被发动机的真空吸力吸入到气缸内进行燃烧，导致混合气变浓，发动机的可燃混合气时而稀时而浓，造成冷启动后怠速会抖动，气温越低，冷启动所需要的油量也就会越大。
处理方式： 检查怠速马达是否有积碳、清洗油路。
二、点火系统异常
二、点火系统异常
检查火花塞、高压导线和点火线圈的工作状况，点火系统如果不良或者是火花塞跳火状况不好的话，同样会导致发动机怠速抖动。处理方式：检查是否火花塞有积碳，应及时处理，如果清洁后还是这样的话，就要更换了
三、油压不稳定所致
三、油压不稳定所致
如果说清洗过油路、节气门并且更换了油垫和火花塞之类的，依然存在怠速时车身抖动，这时建议检查下燃油供油压力以及进气压力传感器是否正常，如果油泵供油压力不正常或者是进气压力传感器数值错误或者工作状态不良，也是有引起发动机怠速抖动的可能。处理方式：检查油压是否正常，有必要的时候需要及时更换零部件
其实除了上面几个原因，可能有些车子是出现这种情况，比如，汽车发动机大修过，基本上大修的发动机，油路什么都清洗过，并且一些不能用的损坏了的零部件都已经更换新的，但是汽车怠速在加油时抖动的更严重，为什么？一般来说，在怠速控制系统清洗和调整后，确认怠速控制系统没有故障的情况下，怠速马达工作性能、进气系统是否漏气等，然后对发动机做一个功率平衡试验进行判断，以此方法来判断造成怠速抖动的某个气缸，然后再进行故障分析和维修。
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