Showing articles & questions for topic
PCV (Positive Crankcase Ventilation)

Related articles

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
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
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
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,...
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
After the car is driven the radiator is cold,but the engine gets to smoke around the valve cover what is the prob?
Hi there. The only two things that will cause your engine to smoke when running cold is the exhaust burning off oil or having a leak on the exhaust manifold or the positive crankcase ventilation valve (PCV) is stuck. The...
Question
Where is my pvc valvle located and how do I take it off and how hard will this process be?
The positive crankcase ventilation valve (PCV) is located in the valve cover, on the rear bank of cylinders. There is a tube that runs from the intake plenum to the valve, and is approximately 1/2 inch in diameter, that carries...
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...

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Get a quote

Post a question and get free advice from our certified mechanics.


Ask a question