Black Smoke Wisps from Exhaust, 2001 LC 100 TD VX

[bigone]

Hi Guys. In the last couple of months the beast has started mildly surging while driving at constant throttle (and cruise)- happens sporadically and at lower speeds (not motorway). When this happens there tends to be a light puff of black smoke visible in the rear view mirror when the surge reduces. Doesn't happen when stationary and the throttle blipped. Runs perfectly ok - injector pump original and done 250k miles.
Recent French motorways trip yielded just over 20mpg at 85mph with top box so doesn't seem like continual over-fuelling?
My thoughts on cause are either an ECU/sensor problem or just plain worn diesel pump?
Any thoughts on most likely cause?
TIA as always.
Brian

 

[bigone]

Just read another thread....I seem to have lost some pulling power at high road speed . Used to sail up inclines fully loaded at +80mph with cruise on but now often slows to the point cruise is kicked-out. Air filter replaced a few k miles ago btw.

 

[ilysawqeewevBen]

Развод
лохотрон
кинули на деньги

 

[karl2000]

Fuel filter? MAF sensor?