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What would cause black smoke from nissan Terrano 2.7td 95 reg?

What is causing the engine to smoke when i put the accelerator down. It is normally of a dark color. I have changed the oil & filter,about to change air & fuel filter. Also added Redex to fuel to clean out injectors.(not sure how long that takes).May be i will just replace the Injectors. Only just bought the car no service history.
ANDREW FLANAGAN, October 2008
No service history because it probably wasnt serviced, and is now worn hence the black smoke. Black smoke is OIL in the combustion chambre, you have worn valve seats or piston rings or the likes.

Jimbo, October 2008
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