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PCV (Positive Crankcase Ventilation)

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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 include excessive oil consumption, oil leaking, a contaminated 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
PCV hose has a hole and the guy said it will get less mileage, but is it bad?
If this engine is the 4.6, then the PCV hose gets a hole at the connection on the back of the intake in the hose. If you continue to run the vehicle with this hose broken, then you will get...
Question
PCV valve and scheduled maintenance
Any time an engine has been neglected like this you should not hesitate to do any repairs to start to get the vehicle back on it's scheduled maintenance. You should have the PCV changed and change the oil and filter...
Question
Can a bad breather filter located under the PCV valve cause my car to turn off after starting it?
No. You should look at the ignition switch not supplying power to the ignition when it is in the run position. This is the most common cause of stall after starting. The ignition switch supplies 12 volt power to the...
Question
Would a bad pcv valve make the engine run hot
Hi there. From the description you have provided, your vehicle's bad PCV and coolant loss are not related. The PCV (positive crankcase ventilation) valve is designed to remove combustion gases that get past the piston rings into the engine. Typically,...
Question
Auto Zone said the case regulator vail is bad. What is that?
If you are referring to the crankcase pressure regulator valve (CPRV), that valve is a part of your car engine's crankcase ventilation or breather system. A common application is on Audi models. If you have an Audi please note that...
Question
Significant cloud of blue smoke from exhaust noticed when I had been coasting for a short time then hit the gas.
What you have described is normal oil consumption for a vehicle pushing 200,000 miles. It may be a little premature at 111,000 miles. Even so, this condition is fairly normal and manageable. I personally own a Toyota Avalon that used...
Question
Smoke in the early morning and when putting high force on the accelerator. Was told it was the PCV valve.
Hi there. From the description you have provided, your vehicle smokes in the early morning and gas tank gets empty faster and this could be PCV related. The PCV (positive crankcase ventilation) valve's job, is to remove combustion gases...
Question
Smoke that is not coming from exhaust when going above 60 mph.
Hey there. If the smoke is not coming from the exhaust, it may be possible that the white smoke is coming from oil leaking onto a hot exhaust manifold or another piece of the motor or exhaust. The PCV valve,...
Question
Does this car have a PCV valve?
All cars that have internal combustion engines have Positive Crankcase Ventilation (PCV) valves. On your car, the PCV valve is at the top of the engine in the valve cover. It is pressed into a rubber grommet. You will see...
Question
I have oil smoking out of my oil dip stick and oil filler on my valve cover. Lots of smoke coming out of my PCV valve
Hey there. Worn piston rings create more crankcase fumes (i.e. the smoke you see coming out of breather tubes and orifices). This is called "blow-by". As long as the PCV valve stays clear, and the engine can handle the fume/clean...
Question
Car doesn't hold idle, I tried changing the PCV valve, what else could be wrong?
If you have to remove the PCV valve to make the vehicle operate correctly, then there is an issue with the combustion in the engine. The rings to the cylinders are not sealing properly and causing lots of blow by....
Question
Can a faulty Pcv valve cause catalytic converter problem
As you may know, a faulty or clogged PCV valve may cause the engine to consume oil due to a lack pressure relief. This may eventually cause problems with the catalytic converter as well due to the car's inability to...
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
I need to replace my pcv but i cant seem to find where it is located. I have looked online but still doesnt help.
In your application, the PCV valve is at the back of the engine on the passenger side. You will see two hoses connected to it, on both the right and left side of the intake plenum. During a mobile visit,...

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