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.
What triggers it, and what does it control? On my 4JB1-TC, there is no PCV valve, but on the attached photo you see the inside of my rocker cover. Don't pay attention to the bolt at right, that's just a bolt I put there to cover the hole so that I could pour diesel into the cover to clean the filter.