04 2.2D Noise under acceleration - Gordon17
My Almera 2.2 (136) Diesel has recently started making a noise like air being forced through a vent. It only happens under fairly hard acceleration and doesn't seem to be related to engine revs or road speed.

It sounds as if it is coming from the left (passenger) side of the engine bay.

I've had it from new in January 2004, and it's done about 40,000 miles, regularly serviced at Nissan dealers.

Any ideas?
04 2.2D Noise under acceleration - Andrew Moorey (Tune-Up)
Any loss of performance? Could be a split intake hose especially if its a turbodiesel.