Hi, I would like some advice from you, my Def 110 TD5 2004 with 80000km, has a decrease in performance after a long acceleration, or at highway speed,or normaly when press full throttle, the engine speed rises but feels low boost, the turbo turns but it is as if the engine was like a "recovery" mode.
If I turn off and on again, the car returns to normal, "ready" and snappy, until I accelerate with all gears at 3000 or much revs or highway or more than 100 km / h.
Another thing that i've made, is install a pressure turbo gauge, and the pressure rise at 1.0 bar or much when the car is normal, while in "recovery" mode, rise max at 0,8 or less bar. I haven't Nanocom.
What could it be?? Overboost??
- MAF sensor replaced new original
- MAP sensor / IAT new
- Fuel pump was checked and cleaned (but not test pressure)
- Fuel filter new
- Injector loom new
- Throttle pedal new
- Wastegate checked and sprayed with WD40

Thanks to all

it does sound like the car is going into limp mode due to overboosting

i've also checked my 110, with nanocom but the mainfold pressure is at max 1,05 bar. During the acceleration does not feel a unexpected power decrease, it is diluted. I realize if I stop (eg at a traffic light) and then restart. In this limp mode the throttle pedal, is much less sensitive

The machine makes it hard to get to 130 .. Any ideas?

could you have a split hose allowing boost pressure to escape?

i've checked them all, i've reclose it all, but I have not noticed anyone with losses. Just turned on my Def accelerates quickly, feels just the push, but if I press full throttle, it go into "limp mode" and I haven't thrust at low revs, the turbo boost is very low.

Classic symptoms of overboost kicking the ECU into limp mode. Turning the ignition off then on resets until the next overboost event.
Have you adjusted the turbo boost even by the tiniest amount?
ECU will register overboost at little more than 1 bar.
Is the wastegate operating freely?
Does the wastegate actuator operate and is the small hose sound and not leaking?
Assuming the engine was running OK and you have not played with the turbo then I'd suspect the MAP sensor fitted to the inlet manifold is faulty.

I have not touched the length of the wastgate, the previous owner ...I don't know, calculating that he puts his hand to pump oil for no reason !!! .. you draw your own conclusions .. anyway will check loosen his arm by one turn .. Then we see ..

Wastegate Modulator