一辆南京菲亚特派力奥轿车,最近出现发动机怠速转速居高不下,转速不稳,转速表指针摆动的现象。首先用故障检测仪检测发动机转速,显示在1000 r/min～1100r/min左右,确实比标准怠速(850 r/min～900 r/min)略高。根据常规情况分析,能引起该发动机怠速转速偏高和不稳的因素一般有以下几个:一是发动机长时间工作,节气门体过脏,积炭和胶质影响节气门正常回位,使节气门关闭时好 A Nanjing Fiat Palio cars, the recent engine idle speed high, unstable speed, tachometer pointer swing phenomenon. First of all, using the fault detector to test the engine speed, it shows that it is slightly higher than the standard idle speed (850 r / min ~ 900 r / min) at about 1000 r / min ~ 1100 r / min. According to the routine analysis, can cause the engine idle speed high and unstable factors generally have the following: First, the engine for a long time work, the throttle body is too dirty, coke and gum affect the normal throttle return, so that Valve closed good