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Bluetec Noise under full acceleration help

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Old Dec 12, 2018 | 04:52 PM
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Tesla Model X
Bluetec Noise under full acceleration help

Sorry to bother everyone... test drove an 09 ml320 bluetec today, everything is in great condition, perfect service history, etc... one thing I noticed however is that under full acceleration, I heard what sounded like a vacuum type noise coming from the driver footwell area, only happened when the engine exceeded 4k RPM, as soon as I let off the gas, the noise went away. no engine lights or hesitation either.

just curious before I make an offer on the car is this a normal noise or perhaps a boost/vacuum leak or trans issue?

through work I can buy a 4 year unlimited mile bumper to bumper warranty for 2500 so if a fix is needed it'll be covered but wanted your input. thanks!
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Old Dec 13, 2018 | 02:25 AM
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1922 Ford Model T / no OBD
Could that be turbo whining?
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Old Dec 13, 2018 | 08:01 PM
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Ml350 bluetec
As kajtek1 said, turbo spooling up. I can here it on my 2014 ML 350 Bluetec when its cold as I am driving through our sub division.
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Old Dec 16, 2018 | 01:39 AM
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GL350 Bluetec and GLS580
Could be one of the intercooler hoses.
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Old Dec 16, 2018 | 02:33 PM
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1922 Ford Model T / no OBD
I had leaks on intercooler to the size that would trigger CEL, but no noise.
What makes them easy to spot are oil stains around.
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