Q: How to Inspect and Replace a Faulty PCV Valve on Hyundai Elantra?
A: The PCV system diverts the blow by gases from the crankcase through it's PCV valve and hose back to the intake manifold where they are burned in the engine. It consists of a hose leading from the valve cover to the intake duct, a PCV valve and a hose connecting it to the air intake plenum. The PCV valve is situated in the valve cover. Detach the hose from the valve then unscrew it from its position on top of the valve cover and finally reconnect that hose. During normal operating temperature, place your finger over either of them (i.e., hoses or opening) while idling; however when there is no vacuum present, ensure that one checks for any blocked or deteriorated hoses as well as manifold port. Finally turn off your engine and shake your PCV Valve listening for a rattle sound; If it does not rattle replace it with a new one. When purchasing a replacement PCV valve always be sure that it is meant for your specific vehicle model, engine size and compare your old valve with new one so as to ensure their compatibility with each other.
Q: Where is the PCV valve located and How to remove it on Hyundai Sonata?
A: The valve cover houses the PCV valve. This requires removing the hose, unscrewing the PCV valve from its position on the cover and then reconnecting the hose. In some models, a foam rubber silencer over the valve will have to be taken off in order that it may be wrenched. Put your index finger on top of the valve opening while at normal engine idle temperature. If there is no vacuum at all or zero pressure when you place your finger on this hole, inspect for blocked value or hoses which are plugged and replace any plugged hoses or valves that have deteriorated. Once this is done, turn off your engine then disconnect the PCV valve from the air cleaner housing and blow through it by mouth starting from an opening near one end of each tube until it blows out through their other ends. If air does not flow freely in this posiiton, buy another one instead. When purchasing, ensure that you select one suitable for your vehicle model and engine size alone. Compare old with new to see if they match before embracing.