电喷发动机的控制系统具有在冷车时发动机以较快的怠速转速运转,而热车后又能恢复正常的怠速转速的功能。但如果发动机在热车后仍保持较快的怠速,即为怠速转速过高故障,其通常有以下几点原因: (1)节气门卡滞,关闭不严,(清洗节气门) (2)附加空气阀故障,(电脑测量消除故障) (3)怠速控制阀故障(电脑测量) (4)水温传感器故障, (5)空调开关、动力转向器压力开关有故障。 (6)曲轴箱强制通风阀故障。
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