You are right. It is air leaking. You either have a vacuum line off the engine, or a leaking gasket in the intake manifold area. It could also be your PVC valve is out of it's grommet in the valve cover. You can locate the leak with the car running by using a mechanic's stethoscope. Just use it WITHOUT the metal pickup rod and diaphragm. Probe the open tube end around areas that sound like they leak or whistle. You can also use a can of carb spray. Just carefully spray around gasket surfaces and when the engine rpm raises, you've found it. Be very careful around a hot engine so you don't start a fire using this method.
If its sounds like a slipping fan belt noise and starts when the engine reaches running temperature it is almost definetely the oil diaphragm to find out for sure wait for the noise to start and take the oil filler cap off or pull out the dipstick while the car is running and if the noise stops you need to replace the oil filter housing unit complete which is a mechanics repair I got the parts from Ford dealer direct at £170 for the housing and £40 for the hose that goes with it with garage bill it came to £340 but it was worth it and make sure you get the volvo part from Ford as this is the part for the engine fitted in ST'S the volvo T5
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SOURCE: Ford Focus ST 2006 wiring diagrams & workshop info
can you check with parts department at ford and see if thy can
otherwisw check with autozone
SOURCE: A gentle whistling noise from a 2001 ford focus,
check pcv hose from the intake to the pipe under coil. They will collapse and leak. chesk while running
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