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PCV (Positive Crankcase Ventilation)

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How to Replace a Vent Oil Separator
A car engine has a vent oil separator that fails when vapors clog the separator, smoke emits from the exhaust, or the Check Engine Light illuminates.
Symptoms of a Bad or Failing Positive Crankcase Ventilation (PCV) Valve
Common signs of a faulty PCV valve include excessive oil consumption, oil leaking, a blocked breather filter, and reduction in overall performance.
How Long Does a Positive Crankcase Ventilation (PCV) Valve Last?
Your car’s engine operates by mixing air with fuel and then burning it. This obviously creates waste gases. Most of those gases are routed out of the engine, through...
How Long Does a PCV Valve Hose Last?
Your car’s engine requires both air and gasoline in order to operate. During the combustion process, it also creates gases. These gases contain traces of gasoline and can be re-burned by injecting...
How to Replace a Positive Crankcase Ventilation (PCV) Valve
A positive crankcase ventilation valve improves emissions in modern engines. Signs of PCV valve failure include oil leaks and poor engine performance.

Related questions

Question
Throttle Body, PCV tube, and valve cover seal needs replaced.
Billing question sent to CS for replacement cost of the PCV tube and valve cover seal.
Question
Oil on top of engine and car won't start
A sudden oil leak could be due to a head gasket failure, crack in the engine block or cylinder head, a plugged PCV system (causing oil to blow out through seals) or similar types of failures. Once the leak point...
Question
My car shakes and makes noise whenever I'm driving like it wants to shut off. It has shut off on me a couple times.
It sounds like you have excessive crankcase pressure as though the PCV valve was clogged ("throws oil out the oil filler tube"). Check the PCV valve and other crankcase ventilation hoses (to the throttle body and air intake). The excess...
Question
PCV valve or hose failure?
Hello. The PCV valve regulates the flow of crankcase fumes to the engine to be burned when there is greater pressure in the crankcase than there is in the engine intake - which is most of the time. If the...
Question
Pcv valve problem
Hello. In most case a PCV valve should not noticeably rattle, though that varies from engine to engine. If it appears to be rattling excessively that could signify that the PCV valve is not secured properly, that there is a...
Question
I have a 2003 Subaru Forester and upon starting this morning it ran fine for a minute or two. Then the Check Engine Light came on.
Too much air flowing into the intake causes the engine to lean out too much air in relation to the fuel and misfire. At an idle, the PCV valve restricts air flow, to reduce this problem. At high manifold vacuum...
Question
PCV Valve Location
This engine has only one PCV valve and it is located in the oil fill tube. If you need help replacing PCV valve contact a mechanic like one from YourMechanic to perform any services you need.
Question
What does the PCV valve and hose look like and where are they located?
Hi there. The PCV valve for this particular model is built into the hose assembly. The hose is a larger hose that connects to the intake plenum and runs to the rear valve cover, you can't miss it as it's...
Question
Oil leak on the hose which came form valve cover to air intake . Engine is new and recently worked on.
Hi there. By looking at the photos that you have provided is shows that the PCV (positive crankcase ventilation) valve is blowing by and causing engine oil to go through the PCV tube. Since your engine has a turbo on...
Question
Car using oil and shaking
The amount of oil usage you have would cause a large cloud of smoke out the tailpipe. If you see smoke out tail pipe then you most likely have piston ring damage and not sealing on piston walls. You should...
Question
Hello. I have a aveo lt 2009. Seems to be doing vaccum trhu the oil deep stick. a machanic told me to change pcv valve
This vehicle's engine does not use a conventional style (accessible) PCV valve. Instead, there is an orifice which meters the flow rate of blow by gases at a rate dependent on inlet vacuum. This PCV orifice is an integral part...
Question
I was told I have oil coming through the air intake does that mean I need a new engine??
If your PCV valve is clogged then you may get excessive blow by of combustion gases and oil into the intake system. You should have the PCV valve replaced and intake cleaned out of oil. If problem continues then you...
Question
My wife's oil cap blew off and oil got all over the engine. Car has no power. When I hook up jumper cables it will rev up but wo
Hi there. This symptom can be cause by a plugged PCV system, or more likely severe blow-by, where combustion gasses blow the oil out of the crankcase and up to the valve covers. This could be cause by broken rings...
Question
How do I Unlock my engine?
Hi there. The PCV (Positive Crankcase Ventilation) Valve maybe plugged up causing the engine to not release any pressure in the engine. So the engine may have built up too much pressure to blow off the oil fill cover. If...
Question
Approximately, how long will a warranty last on a replaced or resealed valve cover gasket?
The engine valve cover gasket should last for about 8 to 12 years. If the gasket is leaking, then the PCV (Positive Crankcase Ventilation) valve is plugged up causing the engine to build up too much crankcase pressure blowing out...
Question
There's a whining noise coming from the engine at idle and it goes away when you pull the oil dipstick out
If you are getting too high of suction in the crankcase what is happening is the engine is sucking in air through the crankcase ventilation hose in the air filter housing most likely due to an air filter that is...
Question
96 Honda accord lx, 2.2 I have replaced dist, plugs and wires, main fuel pump relay. Injectors are spitting gas, i have fire b
Check to see if any diagnostic trouble codes have been stored. If the engine runs (actually "runs", even momentarily, as opposed to stumbles) when you directly introduce fuel, that means there is something wrong with either the fuel system and/or...
Question
What is the best oil to use?
Hi there. If your engine is consuming too much oil, then I would consider checking the (PCV) Positive Crankcase Vent Valve and see if its plugged up. A PCV valve can plug up causing the engine crankcase to over pressurize...
Question
Oil cap is under a vacuum.
The vacuum is due to the (PCV) Positive Crankcase Ventilation valve being plugged up. I recommend replacing the PCV valve and the issue will go away. When the PCV valve is plugged up, the engine crankcase cannot breathe and causes...
Question
Oil in throttle boot
Claimed by Jeff Engstrom

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