My brother just picked up a lovely 87 300sdl with 115k. It is rather sluggish because the turbo isn't engaging- no whine, no power as the rpms go higher.

I read about cleaning out the soot from the boost line to the pressure switch/alda but when I looked at the engine I discovered some differences from the 617 I had read about. Is there a similar soot build-up problem with this engine? What else should I look at?

This car did get a new turbo 10 years ago after the recall.

I have attached a photo in which there is a loose vacuum hose that isn't connected to anything. What should it be connected to and is this the problem?

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Thanks,
Will

1985 300D- 222k- (bad transmission)
1980 300D- (parts car)
1982 300SD- 242k