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Old 01-19-2009, 06:34 PM
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Join Date: Jan 2009
Posts: 4
93 300e 2.8 Throttle Body Noise

I have a 1993 300e 2.8 and the throttle body is making a whining/buzzing noise. It kind of sounds like an electric motor running. It does stop when the throttle body wiring is disconnected. This can only be heard with the ignition on but with the engine not running. It may still be making the noise but is not loud enough to be heard over the engine. Is this an indication that it is going bad?

Thanks for any help

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Old 01-19-2009, 08:29 PM
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Join Date: Aug 2006
Posts: 725
The buzzing noise is normal. I believe it is called dither. It increases the control in electro-mechanical systems.
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Old 01-21-2009, 10:32 AM
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Join Date: Jan 2009
Posts: 4
Good news. Thanks.

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