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.
  The PCV valve is located in the back of the lower intake manifold. It should have a 3/8 hose going from the PCV valve to a vacuum source on the upper intake manifold. The PCV valve is located in the back of the lower intake manifold. It should have a 3/8 hose going from the PCV valve to a vacuum source on the upper intake manifold.