Q: Where is the location and how to check and replace the PCV valve in Ford Escape with four-cylinder engines?
A: If the model is 2004 and earlier, then you need to start the engine and detach the PCV valve from the valve cover. Check for a vacuum at the end of the valve. If there is no vacuum, take out the valve and check if there is a vacuum in the hose. Change it if necessary. Inspect whether the rubber grommet is damaged or not. Clean and examine your hose. You should install a new PCV valve if required. For models 2005-2008, you need to remove your intake manifold and disconnect a hose from a PCV valve. Remove a valve from a crankcase oil separator. Installation will be vice versa. If it's 2009 or later models, then the PCV valve refers to one of parts of the crankcase oil separator.