Hi hope you guys can help!

I can only described it as a noise sounding like a vacuum cleaner which happens when I put the car under acceleration.
Once its gone through the gear cycle it settles down.

I have various theories about possible causes but I’d be grateful for any forum input!

My MB is sitting on 132000 miles and is my daily driver.

Thanks all!

JohnBhoy

Check the air intake system for leakage.

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Jim

Thanks Jim I’ll give it a try👍

also check electric smog pump ( depending on local laws, mines unplugged), transmission dirty filters, can make trans sound like trying to stuff, large breast in mouth and sucking.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt