M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Engine Wrrrrrr-ing sound

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Old Jun 3, 2015 | 03:25 PM
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C230 Sport Coup's Avatar
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C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
Engine Wrrrrrr-ing sound

The engine on our 06 ML350 makes a loud wirring sound and it seems to be getting louder. Anyone have an idea what this might be?
Air pump of some sort? Power steering pump was replaced, and
the sound just gets louder. This is just anytime the engine is running....
not in motion.
I jokingly call it the couger-mobile, since my lady is a few years older than I and that sound is somewhat like that of a snarling cat. Rooww! Rooooww! when you rev it. I can hear her coming a mile away!
Oh, I hope she doesn't read this....

Last edited by C230 Sport Coup; Jun 3, 2015 at 03:27 PM.
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Old Jun 3, 2015 | 11:54 PM
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ML 320 CDI
Any difference when you turn the A/C on and off ?
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Old Jun 5, 2015 | 06:15 PM
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C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort RIP
No. and Vehicle was in the shop about 6 months ago for new
PS pump. Guess I'll have to swing it past the shop.
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