I don't have a mercury in front of me, or even a ford engine. however every PCV I have ever seen was plugged **** end into a valve cover and the other smaller end was fitted into a rather large vacuum hose. So do a hard target search of the valve cover(s) and you will find it. Note that the grommet the **** end snuggles into is hard and crusty and loses vacuum, so is the vacuum hose on the other end. While you are replacing the PCV valve get a new hose and grommet from the HELP section at the parts store and replace them all. Ten bucks will cover all 3 parts. Have a needle nose pliers handy to help you in removing the grommet.
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