Hyundai 26740-21314 Valve-PCV

You can Select Your Vehicle to check if 26740-21314 fits your vehicle.

The PCV (Positive Crankcase Ventilation) system is designed to prevent emissions by drawing crankcase vapors. It operates by pulling fresh air from the air cleaner through the crankcase where it mixes with blow-by gases and then drawn through a PCV valve into the intake manifold. This consists of two hoses, one running from the air intake duct to the crankcase and another one from the crankcase to the intake manifold. The PCV valve is found in the valve cover while it connects the PCV hose to the intake manifold. The flow of high vacuum restricts that of PCV valve during idling so as to maintain its good quality. In case of abnormal operating conditions, excess gases will travel back via crankcase vent tube into air cleaner. Although no routine inspection interval is set for these valves or hoses, sludge build-up can decrease their efficiency over time. Leaking seals are caused due to clogged PCV systems. It is recommended that at oil, air filter, spark plug changes inspecting and cleaning should be done on all pcv hoses Replacement involves removal of pcv fresh air inlet hose, pcv crankcase ventilation hose and pcv valve off respectively; examine-and-change any cracked or deteriorated hoses; clean out pcv valve using solvent and compressed air or replace if residue cannot be removed; re-install as necessary.

Over time, sludge buildup can decrease the efficiency of the PCV system.

The PCV system consists of a hose leading from the valve cover to the intake duct, the PCV valve, and a hose connecting it to the air intake plenum.

After checking the vacuum at the PCV valve, you should turn off the engine and remove the PCV valve from the hose.

When the throttle valve is closed during deceleration and idle, intake vacuum is high, and the PCV valve restricts the flow of crankcase vapors to prevent an excessively rich mixture and maintain idle quality. Conversely, when the throttle valve is open during acceleration and steady cruising speeds, intake vacuum is low, and the PCV valve opens more to facilitate flow. If abnormal operating conditions arise, such as piston ring problems, the system allows excessive amounts of blow-by gases to flow back through the crankcase vent hose into the air intake duct, where it mixes with intake air.