Well why does it happen only after the car gets hot??one would think it
would happen all the time for a vacuum leak?on a side note... if you pinch
close the vacuum lines the pitch does not change it's sounds like a tea
kettle when its hot.
Keep im mind I cannot hear the noise you are referring to, it could be a
normal noise from the AIS motor. If it were a vacuum leak.....it doesn't
mean it has to be a vacuum hose, It could be a gasket at the throttle body
or an intake manifold gasket. A can of throttle body cleaner sprayed in the
area of the noise may pinpoint a leak by spraying the area. Also a rubber
hose such as a 2 foot long heater hose works well to find such a noise,
place one end at the area the noise is heard and the other end placed at you
ear to locate it.
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