I am looking at buying an 87 300d that the turbo went out on. Current owner changed the turbo out and now it has a significant amount (lots more than normal) of blowback when the turbo engages. Any ideas?

He said that he has only driven it a couple of miles (less than 10) since he swapped in the new turbo. I am thinking that when the other went out it could have just blown some oil into the manifold or something. He is thinking the wastegate on the new turbo could be frozen up. Not really sure, so any ideas are great.

Most likely buying it either way as it is a pretty solid car even if I have to do some toying with it. And I really want to get back in a MB Diesel.

 

Your EGR could have a lot of oil sitting in it, and the new turbo is blowing it into the motor. Remove the intake piece going over the valve cover, next take the 2 allen screws out holding the EGR on. See if it's full of oil, sludge put a rag in the intake above the turbo to stop any dirt from falling into the turbo clean out the pasage between the EGR to the inside of the intake. Now make a gasket with no hole in it for the exhaust gases to pass through. I also put some silicon in the vac line controling it to avoid it from trying to open. Now your car will run better even if this wasn't the cause, and it will appear to be leagal with all of the emmissions. As Pa just say's all emmission have to be there as my county does not require them to be tested. So it's there just as a ornament