What is the reason for Nissan Sylphy's unstable idle speed?

The reasons for Nissan Sylphy's unstable idle speed may be: too much carbon deposit on the throttle valve, which needs to be cleaned; The fuel injector is blocked and the seal is poor. Check and clean the fuel injector; There is something wrong with the fuel pressure, so it is necessary to check the oil circuit, oil pump and fuel pressure regulator. Engine control unit failure, or sensor failure, causing the actuator to receive the wrong command.

Spark plugs and high-voltage lines fail, resulting in reduced spark energy or fire.

Check whether there is a problem with its resistance and whether the spark plug is normal.

There are many reasons for unstable idle speed, which can only be eliminated from common faults. If it can't be solved, it is recommended to go to a repair shop for inspection.

Change the oil and filter, and check the spark plug. The spark energy is reduced or extinguished due to the fault of high-voltage line, and the power of individual cylinders is reduced too much due to the fault of valve train, resulting in the power imbalance of each cylinder.

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