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Old 05-12-2001, 10:11 AM
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benzfan benzfan is offline
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Join Date: May 2001
Location: Toronto
Posts: 277
I had this problem last winter at anything below -10C. It went away after about 20 minutes on the highway. It turned out (in my case) to be early winter moisture freezing the vacuum modulator valve. It persisted all winter because I couldn't get the moisture out until I just let the car sit and run for an hour in the driveway. The heat did it. In any case, the modulator is the first place I'd look. Clearance problems within the valve are well known to MB, and they can stick with age. They have service bulletins about that.
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