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hiya
i have a w211 220 cdi with same problem,i wonder what happen with yours
The idle speed control on the 646.821 keeps the idle speed CONSTANT even under load requests such as AC or drive position!!
The ECU controls the Idle speed by receiving sensor data from---engine speed(CPS), coolant temp(CTS),accelerator pedal position(APS), and fuel rail pressure(RPS)-------therefore either the ECU or relevant sensors should be diagnosed to determine why the drastic change in idle speed!!-----either live with it or make the investigation a weekend project for the grand kids---they love electronics and can sort out anything!!
This is not a DIY unless you have a copy of DAS Xentry!!
So it happens on every car. you've been assured it's normal
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