故障现象一辆2010款途安2.0L轿车,搭载CGZ发动机,出现怠速过高、油耗偏高的故障。故障诊断试车发现,该车动力正常,无论冷机还是热机,发动机怠速转速均为1000r/min(正常为680r/min左右),明显过高。用故障检测仪进行检测,无故障代码存储,相关发动机数据流也基本正常。造成怠速过高的原因很多,常见的有冷机高怠速、进气管少量漏气、活性炭罐电磁阀关闭不严、节气门开度略大及空气流量传感器信号错误等,但均有各自的特点。例如进气 Fault phenomenon A 2010 Touran 2.0L sedan, equipped with CGZ engine, appears idle speed is too high, high fuel consumption fault. Fault diagnosis test found that the car power is normal, regardless of cold or hot engine, the engine idle speed are 1000r / min (normal 680r / min or so), obviously too high. Detected with a fault detector, fault-free code storage, the relevant engine data flow is also normal. Idle speed caused by many reasons, a common cold high idle speed, a small amount of leakage of the intake pipe, activated carbon canister solenoid valve is not strict, slightly larger throttle opening and air flow sensor signal error, etc., but have their own characteristics . For example, air intake