I have a 320d of 2000 which has done 104 000k. The turbo boost used to come in at about 2000rpm and again at just over 3000rpm. The 2000 boost does not seem as powerful as it was and the 3000 boost is no longer noticeable. The car has been serviced by the dealers and is otherwise in good condition. What could the problem be? Thanks claude

Check for your catalitic muffler must be stuck that is wy the glow plug light is going on and then you louse presure

ur bacyard mech may hav done things bacward--u need a haynes or some other repair manual/turbo book--scan car using tech II with a data stream for precise solution

you can here it,,,just,,,,but you will fell it more,,try going into top gear at say 30mph hold your foot hard down and keep it hard down wate till the engine revs up to about 2000rpm and if the turbo is working right at about 2000rpm the car will pick up its feet and start flying like a home sick angel
my advice is leave the turbo boost be,,you will only use more fule up and start blowing off pipes or split the intercooler,,,,and thats pricy

That sounds like turbo overboost, ECU cutting the boost off. when you try and boost again feels like your hitting a brickwall, or when it happends feels like your hitting a brick wall...turning the car off resolves this.

Reset your ecu, disconnect the battery for 30seconds - 1minute.

The turbos are terrible on the 320d. If you plan on keeping the car get a new turbo. £950 from BMW themselves. You will get a 1 or 2 year warranty on the turbo. Well worth it.

You have to check the power switch. And the wires connected to the to it.and check up to the battery connection .The kick does not work if the solenoid , the ignition circuits and spark plug is nut functioning try to check or replace them if destroyed already.

This sonds like a boost issue as a fault in the waste gate or turbo could be the culprit.Using as boost gauge,verify proper positive boost in this power band range.

I don't wish to worry you but I think the turbo kicks in at around 2500rpm and it sounds like it isn't doing so, hence the management light coming on. It could be that failing. Be careful here, apparently the turbo uses the engine oil to maintain its operating temperature and if the turbo seals fail in anyway it eats the engine oil, with the resulting total failure of the power unit. So if you do nothing else, keep an eye on the engine oil level. (You may also notice oil smoke out the exhaust as well).
Unfortunately it looks like a trip to the dealer for them to check what the engine management is saying.

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

turbo must have a problem or remember tro vehicles have turbo lag. . . usually mitsu's turbos start giving power around 2500prm - 3000rpm. .

but usually on older turbo diesel mitsus the turbos are the first to go. . . .