Originally posted by techme:
PCV (ported crankcase ventilation)
That would be POSITIVE crankcase ventalation. Before PCV, cars had passive crankcase ventilation, also known as a road draft tube. The road draft tube was pretty useless until the car was traveling above about 25 mph. PCV system works whenever the engine is producing vacuum.
Jim Johnson
98 SVT
03 Escape Limited
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