Q: How do you locate and remove the PCV valve and hose depending on the engine type in your vehicle on Nissan Frontier?A: Depending on the engine, the location of the PCV valve can change. On four-cylinder engines, the PCV valve is in a grommet which is located on the lower right timing chain cover at the lower end of the engine below the power steering pump. The 3.3L V6 has a threaded PCV valve into the upper intake manifold. In 3.5L V6 engines, it is placed in a grommet at the rear of right valve cover. If you are working on a model with a 4 cylinder engine, remove the hose and take out its breather separator. In case of 3.3LV6 engine, remove hose and unscrew from upper intake manifold. As for 3.5L V6engine, open both plenums to get to it then yank out of its grommet . Shake it so that you can hear if it rattles or not shake t causes rattling or not . Replace any valve that does not rattle when shook Once you have got your new PCV valve, make sure that it matches your vehicle and motor size. To ensure that they are similar compare them with each other.