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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
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
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
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
PCV Vales
There is one PCV valve and two hoses on your engine. If the engine oil has been changed regularly, the valve is typically trouble free. You can test the valve operation to some extent by pinching off vacuum to it...
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
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...
Question
Hi Brandon, I have a 2004 Camry V6 3.3 L will the pcv replacement fix excess oil consumption or am I looking at engine/ring/piston
The PCV valve can be visually inspected, and tested, once removed, to determine if it is, or was, functioning. If your engine is burning oil, and it turns out the valve was NOT functioning properly, and thus crankcase pressure was...
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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