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Have the car scanned for fault codes. A power loss in a turbo motor can be caused by simple vacuum leaks. You can check for loose piping and clamps. There are various components in that car that could cause such a problem. These include the turbocharger itself, the turbo boost (N75) valve, wastegate and its linkage, the car's ECU, maybe even a non turbo fault like a clogged catalytic converter or vehicle misfire.
I had the same problem on a 2002 c270 cdi. Turned out to be a leakink vacuum hose. The brakes also makes use of the same vacuum pump as well as the turbo boost actuator.
After refitting and Tightning with Cabell tie my problem was solved.
Full boost full power.
The turbo charger has more to do with rpms than road speed.The turbo uses exhaust gas leaving the engine to push more fresh air into the engine thus creating higher compression and more horse power.You should feel some boost above 1500 rpms if everything is working properly.If not then you should have the system checked by a dealer or a good diesel shop.Good Luck!
The gauge is working fine, the turbo will not kick in untill the engine is spinning fast enough, as the turbo is propelled by exaughst from the engine. So, you can drive around normal and never use the turbo, and climb in the gas and spool the turbo up, what you are noticing is called turbo lag, which is the biggest down fall when compaired to superchargers!
There is a differential pressure sensor mounted beside the 2wd fuse link with a couple of 5mm pressure lines going in each end. These lines connect to each turbo output. The two pressures acting on each side of this sensor produces a voltage read by the ecm which tells it the differential pressure between both turbo boosts during acceleration. Normally the primary turbo leads the boost and the secondary turbo plays catch up until the pressures are even then air valves get opened and shut to bring the second turbo compression in parallel with the first turbo. The two turbos simply act in sequence but function in parallel. Its just like having one big turbo but operating down two smaller paths. The sensor measures the changing boost pressures as the second turbo rises to equal the first. If the generated voltage is not what it expects it shows as a code 66. As you can start to see there could be many different reasons why there might be an imbalance in the two pressures. It could be either turbo causing the imbalance or a faulty bypass valve or pressure relief valve or a number of other issues. It doesnt necessarily have to be a turbo or a solenoid which is faulty. All it means is that the pressure difference between the two boosts is wrong. The real question is why is it wrong. There is a lot you can do yourself to diagnose the cause. If you are able to study the manual which is available free off the internet (do a search for the link) then you will see that you can test many of the component parts quite easily at home and also temporarily replumb the turbos to bypass aspects of the system control to figure it out for yourself. To do this you will have to gain an understanding of how the twin turbo system works. However its not hard if youi strip away the complex jargon hiding simple functions.. There is a mystique of fear concerning working on these motors which is not justified.Just use common sense and logic. Or you take it to a shop and pay someone else to do it for you.
check the piping from the compressor outlet to the throttlebody for boost leaks. also check to make sure that the wastegate actuator is functioning properly. it may be stuck open. the other thing to check for would be an exhaust leak either between the head and the exhaust manifold or the exhaust manifold and the turbo.
if its none of those things, check the blades on the turbo (compessor and turbine sides) for damage and make sure that it turns freely
There may be a loose or split intake (Boost) hose. You may need to have boost pressure checked. The transmission kicking down may also be caused by low boost pressure as the transmission receives boost pressure, to regulate shift pattern. Hope this helps. Regards MMP