Hey guys i have a 2001 ZD30 GU with 321000km on the clock and in the last few weeks it seems to be running a bit "rich" and blowing a little bit more smoke than is usual, its running fine and oils and fluids are all good im just wondering whether the injectors need tending too or whether is something more sinister. I had it serviced 2 months ago and nothing showed up in the mechanics report, if it was a petrol engine i would say it needed a good tune up and and maybe the carby adjusted, any help would be appreciated..cheers Paul