Smoking black - black solid smoke testifies to the truth that in the exhaust gases is really a lot soot. In the old Henfield diesels to some extent is normal, but in the event of newer construction could possibly be cause for concern. normally the result regarding too rich fuel delivery (ordinarily a side effect of chip-tuning), improper injection control (also small injection timing), wear or failure regarding injectors. Short-term emission of black smoke during heavy acceleration or improve the engine load is not just a fault.