The positive crankcase ventilation valve hose is important because it transports excessive gasses from the crankcase to the PCV valve. Once that process is done, it is added to the intake manifold and utilized by the engine.
PCV valve hose functionThe PCV valve hose is a hose extending from the valve cover on the engine to the intake air box or the intake manifold. The PCV valve is engaged when the crankcase pressure rises in the engine when it is on. The PCV valve hoses are components that transport gases from the crankcase to the PCV valve and it goes to the engine. If a hose somehow breaks, the gas won't reach the engine and it can lead to an increase in emissions and poor fuel economy.
Common issues with a failing PVC valve hoseA failing PVC valve hose can lead to the vehicle misfiring, noise from the engine, and leaking.