4.OL
SOURCE: 2004 ford explorer sport trac 4x4
mcdevito75 here, It could be a whell bearing at any of the 4 wheels, it could also be the serpentine belt in the motor. BEST BET have your local auto shop take a look for you, If any of these break, your in for a tow.
SOURCE: Engine location of the PVC
Your vehicle is equipped with a "heated PCV" It is located on the back of the intake manifold and has coolant lines attached to it. It must be unbolted from the manifold. (See picture)
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