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I have posted this problem on a Merc forum but I get the impression that not many Mercedes owners do their own repairs, so I am hoping someone on here might be able to help.
When first started the car will reach full revs and will go like a train, after a few minutes the turbo boost drops off to virtually nothing above 2000 rpm, if you stop and restart its OK again for a while.
Most of the advice I get from the other forums is have the codes read but the cost of that is disproportionate with what I paid for the car.
I have changed the thermostat and temp sensor as it was faulty anyway but no difference. this fault seems to be fairly well documented so I would have thought someone would have known what the problem was even if it was repaired by a garage. Leaky hose and vacuum systems don't seem to be the problem as it will go like a rocket when first driven.
I have been driving it like this since last year when I bought it and 95% of the time its fine at 2000 rpm max as it had bags of torque and a 6 speed manual gearbox and will do 70 mph up most hills, its only when I go up a particularly steep one it causes a problem, changing down doesn't help as you run out of revs. I like the car and it will do 60 mpg+ on the motorway so could live with it as it is, but the full power would be nice occasionally.
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