摘要介绍汽车怠速不良的原因与控制措施，怠速不良是发动机维修中遇到最多的故障之一，如果诊断思路不正确会延长维修时间降低工作效率。发动机怠速不良包括：怠速不稳，怠速熄火，怠速过高，冷车怠速不良和热车怠速不良等问题。怠速不良的故障原因多而复杂，增加了故障诊断和排除的难度。本文就结合宝马发动机怠速不良的故障实例，阐述了故障的检测、分析和故障排除的过程，以便于大家对汽车了解更多。关键词：怠速不良，怠速控制，故障诊断SummaryThecausesandcontrolmeasuresofvehicleidlespeedareintroduced.Idlespeedisoneofthemostfrequentfailuresinenginemaintenance.Ifthediagnosisisincorrect,itwillextendthemaintenancetimeandreducetheworkefficiency.Theengineidlingbad:idlinginstability,idlingflameout,idlespeedistoohigh,coldandhotidlecaridlingbadproblems.Thecauseofthemalfunctionoftheidlespeedismanyandcomplicated,whichincreasesthedifficultyofthefaultdiagnosisandelimination.CombinedwiththefailureexamplesofBMWengineidling,thispaperdescribestheprocessoffaultdetection,analysisandtroubleshooting,sothatyoucanlearnmoreaboutcars.keyword：roughidle,idlespeedcontrol,faultdiagnosis1目录1、汽车怠速不良故障的诊断与检测实例.............................................................31.1预约准备与制单工作............................................................................................31.1.1预约.............................................................................................................31.1.2工作任务基本概述...................................................................................31.1.3制定维修计划............................................................................................31.1.4接车.............................................................................................................41.1.5制单............................................................................................................61.2故障检修流程......................................................................................................81.2.1故障原因分析............................................................................................81.2.2故障诊断过程............................................................................................91.2.3故障排除过程..................................................