How to do Maintainance for PCV?

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PCV Maintainance:

Because the PCV system is comparatively simple and requires minimal maintenance, it’s often overlooked. The common replacement interval for several PCV valves is 50,000 miles, yet many engines haven’t had the PCV valve replaced. Many late model owners’ manuals don’t even have a recommended replacement interval listed for the PCV valve. The manual may only suggest “inspecting” the system periodically.

On many 2002 and newer vehicles with OBD II, the OBD II system monitors the PCV system and checks the rate once during each drive cycle. But on older OBD II and OBD I systems, the PCV system isn’t monitored. So a controversy with the PCV system on a pre-2002 vehicle probably won’t activate the MIL (malfunction indicator lamp) or set a diagnostic trouble code (DTC).

PCV valves can last a protracted time, but they will eventually wear out or clog — especially if the vehicle owner neglects regular oil changes, and sludge builds up within the crankcase. The identical sludge and oil varnish that gums up the engine can even plug up the PCV valve.

 

PCV Replacement Tips:

When replacing a PCV valve, confirm the replacement valve is that the same because the original. External appearances will be misleading because valves that look identical on the skin are also calibrated differently inside. If the replacement valve doesn’t have the identical flow characteristics because of the original, it’s going to upset emissions and cause driveability problems.

The PCV hose that connects the PCV valve to the engine should even be replaced when the valve is modified. Use a hose that’s approved for PCV use only.

 

NOTE:

Can’t find your PCV valve? Some engines don’t have a PCV valve but use a crankcase ventilating system with a set orifice oil/vapor separator. The separator functions similarly to a PCV valve, but there’s no movable pintle or spring inside. The separator is just a little box with some baffles inside and a calibrated hole that permits the intake vacuum to tug the blowby vapors back to the manifold. Sort of a PCV valve, the separator can plug up with varnish and sludge, causing driveability and emissions problems.

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