"Propeller" type noise when starting or stopping?

[Royal]

My '04 645 has a noise best described as a "propeller" sound when I start the car, shift into gear and feather the gas. It also happens when I come to a complete stop, or if I lightly step on the gas in gear or in Park.

It could sound like a winding or shifting noise.

Anyone have a clue, or hear this before?

Sadly, I am out of warranty.

[dimitri]

exaust leak>>?? maybe

[Leslierc]

Check your belts.

[Royal]

I dont think it is an exhaust leak the way it occurs, I had a mechanic look at it and he suggested I take the car to a BMW dealer as he did not want to start tearing into it.

[645cruisetop]

I just took my 04 in for a noise that happens under same conditions- can't say mine sounds like a propeller, but rather something like a dieselling vibration sound, which at first I thought was a loose cover in the engine compartment. Technician said it is normal for this engine, which I don't buy as its too prominent and so BMW wouldn't have left it that way. I'm curious. It does go away once past the featheirng point...

[jweisgal]

If you are talking about the engine having a sound like it is not steady (like humming in cycles) in the start up - my authorized BMW dealer basically said that it happens in all the V8 engines (750, 650) there is a part that they opted not to use for this engine - it goes away shortly after warm up - but it isnt a big deal.