hi we have a doblo which goes fast, no starting problem's first time all the time we bought for a little over £2000 and have had it for less than a year bit of black and blue smoke from it have just spent over £2000 on repairs from garage and still have blueish smoke and rev up hard black soot left on road, but if you put foot on clutch and turn off engine then turn straight back on NO smoke doesn't smoke all the time can drive for miles no smoke then next day 4/5 times bad smoke we are stuck we thought maybe something electrical maybe a sensor?
