just bought my first car, an 87 300D. just like to introduce my self and say hello. my brother in-law is a diesel Mercedes enthusiast and he said that this was the place to go. only has 260,000 miles runs like a top but doesn't seem to to be going into boost. any help would be greatly appreciated. thank you

I've never seen a top with a turbo so maybe it's just behaving like a top

That's your welcome from me

There is a plastic line (original) or rubber hose (replacement) from the intake manifold to a vacuum switching valve just ahead of the windshield washer fluid reservoir. The line continues to a device atop the injection pump, and possibly splits to another device on the driver fender. Ensure air can flow freely through this line. If necessary, take a 12mm wrench and remove the fitting in the intake manifold. Clean out any goop clogging the fitting. A spritz of brake parts cleaner should do it. Do not overtighten this fitting! The threads on the manifold strip easily. Clearing that air path should allow manifold boost pressure to flow to the ALDA, the device atop the injection pump, to signal the IP to allow more fuel in response to additional air in the manifold.

Sixto
87 300D

yea ill have to try that.