Hi I have a 97 disco 300tdi with a loud squeeling noise from the water pump and pas pump area i have replaced the auxillery belt tensioner bearing with no change. What else could cause this fault cheers

Hi i have a 300Tdi with an intermitent fault. It drives fine for a while and then you notice a clicking sound then a slight loss of power then gets worse if you stop and rev the engine there is white and black smoke. is this an injector fault?