I have an 83 audi 5000td and i notice that when i flow it there is a cloud of black smoke. The car seems to run well and the engine is smooth. It also only smokes when i floor it. This is my 1st diesel and i dont know alot about it. I was told that there might be a problem with the timming on the injector pump. Does anyone know if thats the case? I've been keeping an eye on the oil and i know that its not burning any so the problem has to be from fuel. I'm also getting about 33mpg and that seems a bit low to me. One more problem that i have noticed is that sometimes after the turbo hits full boost the boost will then drop off and it will not build boost again unless i come off the gas and hit it again. Any help would be great thanks.