Okay here’s what I have…..a 1989 560SEL. When driving on level ground between 40 and 50 mph there is an odd sound VERY similar to a whistle buoy on the ocean. It only makes the sound when pressing the accelerator to maintain the speed. When I remove my foot from the accelerator pedal the noise stops.

What is causing this noise and what's the fix.

Thanks!!

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1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500

This will fix anything.

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"It's normal for these things to empty your wallet and break your heart in the process."
2012 SLK 350
1987 420 SEL

don't drink

anyone have a real answer??

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1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500

This is whats called a "throttle sensitive" noise. So I would look at air cleaner sealing, possibly a wheel bearing, or a belt. Hard to determine over the internet!!! Make note of what RPM as well as road speed that the noise starts and try to duplicate the noise sitting still, bringing the engine up slowly to that RPM, then feather the throttle. Or when it starts, put the car in neutral while driving at that speed to see if its engine speed sensitive or in fact throttle sensitive and report back.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.

Please stop, I'm crying

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL