I have a customer that has a whiff of diesel exhaust while driving and a black soot mark that appears on the heat shield opposite the turbo, any suggestions?

Had one that was getting exhaust smell in car and had been to several shops before us , ended up being fresh air doors were not working properly. Now as for the soot, you will have to find the leak to fix that.

__________________
euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck