No power turbo does not kick in and black smoke out exhaust. A sensor or switch that kicks in turbo the dealer told us but they are not sure. We have been waiting a week for the part to come in so they can try it but they are not sure.
I have the same problem black smoke in low gears and turbo takes asecond or so to kick in i have been told to check air filter is not blocked and if not possible a injector problem i will update if i get to the bottom of itman a van
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before replace your turbo as suggested so called try and error mechanics on your cost, you might want to check your turbo resonator, its common problem with dodge sprinters, in europe no resonator fitted on mercedes sprinters
possibly the turbo check the hose from the turbo to the intercooler rad aslo check the blades of the turbo for catching the casing and for lift dont forget mercedes turbos have very slight lift anyway.
This is almost certainly a split hose - mine was the large hose coming out of the bottom of the EGR valve. Speaking to a parts guy at my local Jaguar dealer, he said that the new part is uprated as Jaguar are aware that this is a problem. The split allows more air in and results in the ECU changing the mixture and over fuelling - Black smoke is an indication of un-burnt Diesel. As well as the black smoke you may also notice a whistle/whine or sucking noise when you accelerate and a lack of power / lumpiness at around 2000rpm.