You've got a leak in one of the air hoses between the turbo and the intake. The most common one seems to be the small one on the exit of the intercooler. The rubber hoses are attacked by oil in the intake - you'll see rubber rot exposing the reinforcing cord inside the rubber hose. For a temporary fix, duct tape actually seals it up pretty well. Replace the hose as soon as possible. Dealer part, or get it through one of the online parts sources.
Plenty about this in the FAQ, by the way.
Good luck!
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Rob Bareiss, New London CT ::: '86 244DL- 215K, 87 244DL- 230K, 88 744GLE- 198K, 91 244 180K
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