vivaro 2009 2.0 chucking quite a bit of black smoke out on hard acceleration, if i look in the mirror it totally obscures the car behind, had new injectors in last year, mpg doesn't seem to have dropped, been doing this for quite a while now, going to give it a service over xmas to see if it improves, is there any other common problem what can cause this or what to check, when i did the injectors last year i noticed quite a bit of oil in the turbo intercooler pipe cheers
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