Question about 1997 Mercury Grand Marquis
Can be the Alternator bearing or a serpentine belt pulley close by. A whistling noise can be a Vacuum leak. Sometimes when installing an Air filter, the ductwork is not reconnected perfectly.
A PCV valve can sometimes make a noise. The spring tension inside the PCV valve should keep it closed until a strong Vacuum pull opens it. This would usually be masked by the other engine noises at higher RPM.
About the only other thing you can do is use a water mist from a spray bottle on the engine seams as it runs. Follow vacuum lines and so on. Water will affect RPM so any openings can be detected.
Posted on Dec 26, 2013
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Posted on Jan 02, 2017
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