Quote:
Originally Posted by tomas_maly
My 300SD has a 'whirring' noise (fairly low pitched) while I press on the pedal. It changes pitch as the RPM's go higher. The 300SD sounds like a jet engine (or race car) when I'm accelerating. If I let off the gas at all, the noise immediately stops, irrelevant of RPM's or driving speed.
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Check that the U-shaped tube from your air cleaner into your turbo inlet is seated properly. It could also be that your turbocharger is simply making noise. That is a sign of wear but in my experience on these cars it means very little (will continue working fine for years).
Are you sure it's coming from under the hood?