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Old 10-12-2012, 03:06 PM   #18
redbull 325is
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Join Date: Jul 2006
Location: NC
Posts: 718
My Ride: 325xit/6
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Originally Posted by SamDoe1 View Post
PCV Valve = Positive crankcase ventilation valve

On our cars, you have probably heard it referred to the crankcase vent valve (CCV) or oil separator. You don't need to replace till you have a problem and those include excessive burning of oil and/or leaks down the lower driver's side of the engine compartment.
Sometimes a bad pcv will not cause oil issues, but the bad membrane will allow for extra un-metered air to enter the intake manifold from the crankcase and cause the fuel trims to be off. With that in mind and how cheap they are (under $200) i'd definitly do it before the car starts misfiring like a pig and throwing cels.
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