loud hoooing noise
 

:confused:Hi,
I have a 1990 560SEC with 88,000 miles. Recently, it has started to make this strange hoooing noise, and it is quite loud. It doesn't happen all the time, and it doesn't sound like a bearing noise. Could it have something to do with the exhaust system? Thanks for your input.
Max

I would suspect a problem with the air pump in the emission system.

hey
try to check your differential cause i had a sound like the one u discribed that come louder when deccelerating ( when speed goes down ) it was the differential that making that annoying noise
hope that was helpfull

Are you sure?
 

That you weren't just driving past the University of Virginia Hoos stadium at the time they scored a touchdown?

At what speed do you hear it? Is it a "woo woo woo" or "hooooooooooooooo"?

Hi Richie,
Thanks for your question. It is a hoooooooooing sound. And it seems as though it is coming from the lower right side of the engine, probably underneath. It seems to happen
after the engine warms up. After using the car, if I let it idle for a while, the noise stops.
Thanks,
Max

Noise!
 

Passed by some good looking gals walking down the street?

Sorry, could not resist!

Maybe very low on oil.

Rob

+1--- Located on bottom of pass front side of engine. May just have a cracked hose..........

Love your sense of humor