Lately, in the last week or so, I've been noticing heavy black smoke and a general lack of boost.
While driving casually, nothing registers on my gauge. good gauge, good line.
When I accelerate moderately, it peaks at 5PSI.
Let the car cool overnight, and I have normal boost and no black smoke.
Drive up a fairly steep hill, tranny kicks down, and the onece normal boost reading of 15PSI at that RPM continues to build till about 20PSI then drops off to normal levels rather abrubtly. Once I get my RPM back down in 4th gear, the next moderate accelleration is heavy smoke and no boost.

Sticky wastegate. because the lack of boost also varies. one instance it'll peak at 5 others it'll peak at around 8 or 10. It's almost as though the valve stem is hanging up in it's bore or something.

how does one go about unsticking a stick wastegate? take apart and clean?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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