Motor problem

Someone who helps me form a hypothesis or response to my problem?, Why the Nissan Frontier 4x2 with TD27 engine, the following failure. When traveling on the road and it is required to give more power to the car, either to move on to another, Derrepete when the conuctor begins to demand the TD27, it begins to throw White as a point of losing the power quickly, the most prompt solucian is to move to the next change to lower the revclutions and so the white UO dump is removed.
The strange thing is that not every time it presents this failure, even and tested and I put new air and fuel filters wix. And I failed ... what should be?

PA When it starts to throw that smoke it is because the injectors are giving more fuel of the proper, at high or low acceleration the injectors are damaged or the diesel pump is giving more delivery of the normal thing this test is done as many kilos as many kilo-boys does for a gallon and thus verifies the fuel spending, it realizes the if the injectors are damaged

I already tested, the Nissan D22, TD27 engine when new towards 47 km/galon, now with 121783km only 43km/galon on the road (Honduras) only slopes up. and in the city using the air conditioning 31 km/galon.
What do you think about it? Are the injectors, the injection pump or the fuel quality here in Honduras?

Sometimes the car walks that it seems that I would like to fly, but then even the turtles want to pass.

For me that can be the fuel if the failure is not constant. For that, you would have to try for time lapses in different gas stations. When the smoke is white, it is almost always a lack of fuel, water or some strange additive in the fuel. To know you would have to do the fault of the way to know what to do. If you spend more fuel can be due to lack of strength. But someone may have another opinion, in Diesel I have little experience, mine is more gasoline.

The white smoke is raw oil without burn, the 2 main causes for that smoke are: cylinders without compression or out of point. Since the fault makes it at high revolutions and when there could be 2 probable causes, one is that when the engine exists the temperature increases and I could produce that the valves do not close correctly and stay without compression, the other is that in high the injection pump not of the correct advance values ​​and the injection point is under Internal transfer pressure and do not pushing what is necessary to the progress and the other is that the internal fuel pump has wear or the valve that regulates the transfer pressure regulates. If it were due to excess fuel or air covered, the smoke would not be black but black, since it is other but burned fuel. The first thing I would do would be to check valve lights, then verify the static injection point, if that is fine, then it would measure motor compression, if the compression is within the normal values, it would remain to be seen the fuel lines and finally the injection pump