Oh man, where to begin...

[Astroman]

So the son of my friend, against all advice, buys a '92 300SD W140 off of ebay, sight unseen.( ) This is a kid who can barely change a tire. He travels 3 states away to pick it up and finds it's been wrecked more than once, the tank is completely full of fungus, and the interior has been thrashed by some amateur stereo installers. (and to top it off it was owned by a chain smoker) He thought he was getting a deal because it was about half of the blue-book price. The seller basically said "I've got your money, you're stuck with the car, hit the road". So after having it towed to the dealer to get the tank steamed out he limps home at about 45mph, spending a small fortune on fuel conditioner and injector cleaner. I'm trying to help him out. He's had the injectors overhauled by a reputable shop, who also checked out the rest of the engine. The good news is it looks like the engine was replaced recently, and it purrs like a kitten.(603 I think) The bad news is that the turbo doesn't spool up. The diesel shop that did the injectors pulled the turbo and checked it out, and discovered that for whatever reason, the "computer" is not closing the wastegate. When they manually close the wastegate the boost comes up no sweat. So needless to say, the cars a dog. I've been enlisted to help the kid out, but my knowledge of the 140 is limited, (read nonexistant), and I'm looking for some information on where to start on the turbo. The wastegate appears to be vacuum operated. Any suggestions? Oh yeah, the door locks and A/C are inop also..lol Poor kid has already pumped in a couple thousand bucks just getting it home. He could have had a beautiful SD, or pretty nice SDL by now..