Sonata SONATA emission control system is mainly composed of crankcase discharge control (PCV) system, fuel evaporation (EVAP) control system and exhaust gas recirculation (EGR) system. SONATA emission control system in the car layout.
    Repair of crankcase discharge control system:
    Crankcase discharge control system is mainly crankcase forced ventilation (PCV) system, PCV system is the role of channeling into the crankcase of the channeling gas and oil vapor mixture into the engine combustion chamber for combustion. The core of the system is the PCV valve, when the PCV valve normal work, the crankcase of the discharge will be effectively controlled.
    When troubleshooting a crankcase discharge control system, follow the steps below:
    1. Remove the ventilation hose from the PCV valve
    2. Remove the PCV valve from the rocker cover plate
    3. Reattach the ventilation hose;
    4. So that the engine is in idling state, as shown in Figure 2, with your fingers at the open end of the PCV valve to confirm whether there is a vacuum, under normal circumstances, should be able to feel the degree of vacuum (finger by suction), otherwise crankshaft The tank discharge control system is not working properly, apply the cleaning solution to clean the PCV valve and the ventilation hose, if necessary, to replace.
    Diagnostic PCV valve failure when the operation method is:
    1. Remove the PCV valve
    2. Will be clean hose connected to the PCV valve, blowing from the side of the cylinder head, the air should be able to pass smoothly from the side of the intake manifold blowing, the air should be difficult to pass, if the test results and the above requirements do not match, You should replace the PCV valve;
    3. Insert a small stick into the PCV valve from the threaded end of the PCV valve. Check that the plunger in the PCV valve is moving. Normally, the plunger of the PCV valve should be able to move. If the plunger does not move, the PCV spool Plug card, need to clean or replace the PCV valve, it should be noted that, when installing PCV valve, the tightening torque of 8 ~ 12N · m
    4. Reinstall the PCV valve, check the gasket and the connection for leaks, rupture or other damage, if necessary, replace.