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Q:

car make grinding noise when starts and dissappears after a few minutes
on 2006 Mercedes-Benz C280 4MATIC

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car make grinding noise when starts, after a few minutes noise will dissappear
(2) Answers
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Sounds like a secondary air pump. On the next start up have the hood open and try to find out what is making the noise. It will help us out...
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It would be best to stop by and have an experienced technician listen to your grinding noise. Maybe your starter is going bad. It is hard to tell with out actually hearing the sound.
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