Hi, Got a problem with my van, Iv got a strange noise coming from the engine when i change gears (high revs) seems to make a sucking noise !

Iv found where it is in the engine compartment but not sure what the part does, It sits on its own bracket mounted above the engine, its quite small with a electrical connection and what looks like breater pipes feeding of to engine, brake servo and a couple of other things, on the front of the part it has a very small air filter which looks like its ment to suck air in, when i pulled this filter off it still makes the sound,

The noise also happens when i shut the engine down and last for about 10 seconds sucking in air and you can also here the electrical connection making a strange servo typr noise.


Anyone else had this trouble ?

Advice much appretiated

Rob