I have an Iveco Daily with a really heavy thick black/grey smoke only on acceleration.
It starts and runs ok. Customer has noted that it seems to be using a lot of oil, but it is full at present.
The smoke is so bad it is almost like it has a stuck shut air dozer but I have removed the EGR throttle valve so I have unmetered air straight into the inlet manifold and there is no difference.
I am guessing this must be an engine fault , a blockage in the manifold or inlet valve problems but wondered if anyone has had this problem before ?