Funny hissing type noise

[olance]

My van has developed a new noise, any ideas what it might be? There is a hissing/air escaping type noise when the engine idles/chuggs along which goes when I accelerate. It comes from the back, seems to be in the general location of the air vents/down the side of the air vents.

Cheers!

 

[Turkish]

I had a similar problem, re sat the manifolds to the carbs two or three times to only find it was a split in the tube to the servo just after the tinware.

Give it a whirl

 

[olance]

will do, cheers!