If the crank case vent is clogged, it will cause this. This is the hose that goes from the driver's side valve cover to the engine. The hose connects to the engine via a alumminum block. That block has a small hole in it that will stop up. Use a sharp pick to clean it and some carb cleaner.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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