No matter how tightly within the prescribed specifications an engine's piston clearance and ring tension are in its cylinders, a certain amount of fuel and combustion vapor slips past and enters the ...

All engines need some sort of crankcase pressure relief. Whether it's in the form of a simple breather, or a more effective PCV system, you need a way to vent blowby gases inherently generated by 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 ...

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 ...

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 ...

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 ...

Q: I own a 1994 GMC 3/4-ton van with a 350 engine. In the last year, the oil pressure has been low, just above the red, and the low warning indicator is on at idle. When I speed up, the pressure goes ...

Q: I have a 2015 Nissan Frontier. It has only 57,000 miles and does not leak or burn oil, to my knowledge. I take it to a reputable national oil-change place every 3,000 miles for oil and filter. I've ...