Vinegar's acidity is what makes it such a good cleaner. Because vinegar is so acidic, it can counteract some icky buildups. It can dissolve away soap scum, brines left by hard water, and glue left behind by stickers.
The PCV valve is a control device which sends partially burned gases that come from the engine's crankcase to the combustion chamber. Its name, PCV means Positive Crankcase Ventilation and is one of the oldest and most used emission control devices.he PCV valve is a control device which sends partially burned gases that come from the engine's crankcase to the combustion chamber. Its name, PCV means Positive Crankcase Ventilation and is one of the oldest and most used emission control devices.
Answered by The Community. Making the world better, one answer at a time. Nissan's swirl control valve (SCV) is an actuator that modulates intake air flow into the engine to increase low and high engine speed efficiency. The SCV does this by constricting the intake opening during idling and low engine speeds.nswered by The Community. Making the world better, one answer at a time. Nissan's swirl control valve (SCV) is an actuator that modulates intake air flow into the engine to increase low and high engine speed efficiency. The SCV does this by constricting the intake opening during idling and low engine speeds.