Depends on which engine you have
the simplest way is to follow the largest vacuum line from the main vacuum port
PCV Basics
PCV stands for Positive Crankcase Ventilation.
All car engines have a PCV valve and it is located on top of the motor's
valve cover. There is a vacuum line attached to it. It pulls out of the
valve cover and if you shake it, you should hear a marble knocking
inside it. If you shake it and don't hear anything, it's bad. It costs
less than 5 bucks to replace.
Location
* 4.0L is located in the valve cover near the brake booster
* 5.0L is located behind the intake manifold (engine rear)
NOTE-Most people that are asking actually want to know not only where is
it but also how do you get at it to replace it.
Often answers say that you need to dismantle the intake manifold to get
to it.
This is a major and unnecessary approach, for example, on the 2000
Explorer with a 5.0 V8
Below is an additional suggestion on how to access a PCV valve on an
2000 5.0 V8 Explorer
The PCV valve is on the rear of the intake manifold (the intake manifold
is also on top of the crankcase so PCV valve has direct access to
crankcase)
To replace valve and/or its bushing:
Hope this helped (remember comment and rated this). Good luck.
SOURCE: 1998 Ford Explorer sport 4.0L 4x2 PCV Valve Location
the pcv is located on the rear(firewall) of the drivers side valve cover.turn counterclockwise and pull to remove be careful there are 2 small tabs inside the pcv hole in the valve cover(can feel with small finger) this is to hold valve in place so it wont leak.if you have a oil leak at the pcv a quick fix is to put a small amount of silicone around the pcv o-ring and install.wait hours for silicone to set up.
SOURCE: pcv valve :where is it located on a 1999 ford explorer sport 2wd
It is located at the back of the engine near the fire wall. It is gray with a T connector at the top with two hoses coming off of the T and going forward into the intake manifold.
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