Out of time.
Thay are not inside the intake. They are UNDERNEITH the INTAKE. It has 2 sensors and you can not see are get to them until you remove the intake.
the intake manifold is what takes air coming from the intake and directs it to each intake valve in each cylinder
The intake runner and the intake valve (naming only the head assembly).
Intake valve must be open
generally it isn't really coming from the intake rather it is echoing from the engine through components into the intake. the intake is hollow so it echoes most sounds making it seem noises come from the intake when most of the time it's not the part making noise. check your oil level. if you have OHC's that could be a next place to check
white smoke=water. probably the intake or intake manifold.
Check your Fuel Pressure Regulator under the intake plenum that is on the fuel rail. Had the same issue myself, gas coming from the intake.
Inside of the engine head(s).