Positive Crankcase Ventilation—three dirty words, but do they really need to be perceived that way? In general, the PCV system has two main functions: vapor relief and liquid separation. PCV systems ...

Internal combustion engine blowby, whether gasoline or diesel, occurs when part of the compressed mixture of air and fuel leaks past the piston rings during the compression or power strokes of a ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace the ...

Crankcase ventilation is almost provided in all automotive engines. Its prime job is to prevent the dilution of lubricating oil present in crankcase which may lead to corrosion of crankcase metals if ...

My 1995 Volvo 850 non-turbo (with 160,000 miles) has an oil leak at the rear main seal or RMS, probably because of crankcase pressure. When I remove the dipstick and stick a balloon over the top and ...

Question: I'm working on my Ford E-150 van with a 4.2-liter. Can you tell me the location of the PCV valve for this engine? I took the air housing covers and the engine cover off looking for it, but ...

My wife drives a 1991 Ford Escort. About every six weeks or so, I have to replace the air filter, because oil builds up in the box that holds the air filter. No mechanic to date has been able to solve ...