Buzzing throttle

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stevesey

MB Enthusiast
Joined
Sep 3, 2007
Messages
2,969
Location
Bristol
Car
Alfa 156 1.8TS
If I turn the ignition on, the throttle buzzes. It's always done it, but seems to be noisier now. Sounds like the stepper motor that actuates the throttle is flicking between two positions continually. Is this normal? Or is there something I can do to fix?
 

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