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Unstable / fluctuating rpm during idle

By hotice, November 7, 2019 in C-Class W205/S205('14-Present), W204/S204('07-'14), W203/S203('00-'07), W202/S202('93/'96-'00),W201('82-93)

w204
c180

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hotice 0

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Posted November 7, 2019

Hi all,

Recently my w204 started having unstable / fluctuating rpm movements (between 800 - 1000rpm), accompanied by a whine each time it fluctuates up. It only happens with the air con turned on, during parking, neutral and drive mode. Brought to a workshop and they said throttle is dirty, recommended a clean up of the throttle body. Another workshop suggested that it could be the air flow sensor / valve. Was wondering if any one experienced the same, and could offer some guidance, please.

Thanks!

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