Low Acceleration and black smoke

[Mandy Moo]

I have a 2007 Rav4 D4D with 100,000 miles on the clock that is struggling to accelerate in 1-3 gear and is throwing out a lot of black smoke in the process.

Any ideas what this could be would be very much appreicated?

Edited July 22, 2019 by Mandy Moo
Title change

[Avalon]

This unfortunately is one of those ‘how long is a bit of string’ type questions. My first thought is turbo, but without actually investigating, that’s just me assuming the worst based on a very limited description.