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There are 2006 KIA Sevilla cars with a mileage of about more than 60 thousand km. Users reflect: the engine is idle at idle speed. Fault diagnosis: according to the failure phenomenon, the initial judgment is that the idle control valve is blocked or damaged. After the idle control valve is removed and the adjustment is removed, the vehicle is still idle and extinguished. After the idling control valve is replaced, the vehicle can start the idle speed, but the idle speed is unstable and the vehicle has a clear jitter, which indicates the car fault and the fault. Idle control valves are not very important. The vehicle's fuel system and the ignition system are checked separately. The fault code P0016 is read by the fault detector. The fault content is "the position correlation of the cam car by / from the car." According to previous diagnostic analysis, the vehicle problem may be on the valve timing. The KIA sedan car engine uses modern CVVT (Continue Variableva lVe Timing, that is, continuous variable valve timing) technology. Modern CVVT systems mainly include OC V solenoid valves (i.e. oil controlled electromagnetic valves), CVVT actuators (intake cam teeth), CVVT oil filters, related sensors, ECU and so on. Its working principle is that the oil is supplied to the OCV solenoid valve through the CVVT oil filter and the related oil channel. ECU controls the action of the OCV solenoid valve according to the engine operating parameters, and supplies oil to the oil chamber or valve timing delay oil chamber to the CVVT actuator, manipulate the piston movement in the CVVT actuator and then change the gas continuously. The effect of timing is achieved by achieving 3 timing of intake valve timing, delay and maintenance (Fig. 1). The movement of the piston of the CVVT actuator is determined by the OCV solenoid valve, and its oil pressure is controlled by an oil pump. If the piston rod in the OCV solenoid valve is stuck, the engine oil will not go in and out of the CVVT actuator normally, and the CUT system can not work normally, and the distribution of gas is in phase. If there are problems, it will lead to idle stalling. According to the above analysis, the author thinks that the malfunction of the car is caused by the failure of OCV solenoid valve. The OCV solenoid valve of the engine is removed and checked. It does find that the internal piston rod is stuck, causing the engine oil to flow into the advance oil chamber of the CVVT actuator when the engine starts, so that the gas distribution phase is abnormal. Troubleshooting: after the replacement of Off solenoid valve, trial run, vehicle idle speed return to normal, troubleshooting. Maintenance summary: idling fault maintenance is often considered from the engine intake, fuel supply and ignition, while the intake aspect usually considers the dirty or damage of the idle control valve. It can be seen from this case that the idle speed problem may also be out of the gas phase anomaly, the solenoid valve malfunction of the variable valve timing system, and the idling or idling instability after the starting of the vehicle, therefore, when the idle speed problem is not obviously improved after cleaning or adjusting the idle control valve, the variable valve is used. The possibility of solenoid valve malfunction in variable valve timing system should be considered in the timing system.