Saturn 9128535 Hose,Pcv

The Positive Crankcase Ventilation (PCV) system has a very important function of minimizing hydrocarbon emission through venting of crankcase emissions laden with unburned hydrocarbons. On four-cylinder models it is made of a single hose going from the valve cover to the air intake duct and small casing located beneath the valve cover with blow-by vapors from the crankcase entering internal passages of the vent housing directing them to the intake duct and then into the combustion chambers. V6 has an engine vent adapter on the intake manifold, a vent housing at the rear cylinder head as well as two hoses which help transmit fresh air as well as crankcase fumes. A bad PCV system has the potential to harm the engine parts, due to which hoses should be checked for cracks or obstruction and need to be replaced if required. A plugged hose may make rough, stalling or leaking or show signs of oil leakage while a leaking hose will have the same symptoms, but with high idle speeds. A functional check is done by removing the other end of the PCV hose, cranking the engine, and checking for the vacuum. Should excessive crankcase pressure be suspected, it should be boiled to check by a professional. For the case of component replacement, detachable PCV hose may be used by unscrewing clamps, though the vent housing on Four cylinder vehicles is part of the valve cover and cannot be replaced. Housing of vent is disengaged from body in V6 models but several of its connections need to be undone and proper attention paid when reconnecting it with a new gasket and mounting it securely.