Engine emitting black exhaust smoke and lacks power when accelerating

you did not specify mileage on this engine.... compression may be an issue, also large amounts of white smoke pulls me over to a lack of fuel, lean condition on diesel creates this fenomena, check delivery lines and pressures,

Depends on the colour of the smoke.
Unlikely an engine will sound healthy emitting black smoke - excess fuel.

An engine could sound healthy emitting white smoke (steam from coolant) but not from white smoke (excess unburned diesel).

Most engines emitting blue or blue-grey smoke from burning engine oil can sound very healthy.

If it isn't a dirty, blocked air filter, the EGR is always a firm suspect (Exhaust Gas Recycler). The EGR recycles a limited amount of exhaust gases and can become quite gummed up with soot and oil.

The Saab 2.2 tid suffers from this big style. Cleaning - takes about 30-45 minutes - usually solves the problem.

I wouldn't imagine that cleaning your VW EGR will take long or be too difficult. Have a look on the following link:

vw tdi egr Google Search

I would check to see if there is a restriction in the fuel return lines. Also the o2 sensor might be lazy.

not enough detail
to get an engine to accelerate , the air /fuel mixture is moved to rich in accordance with engine rpms
the more rpms the richer until the peak rpms are reached
( accelerator pump-power valve in carbies and ECM settings according to accelerator position
black exhaust smoke in diesels
so if you press the accelerator slowly then the air/fuel mixture is altered constantly in relation to the pedal setting
If you floor the pedal then it moves to rich and you get black exhaust smoke until the air mixture is again in balance

black smoke indication of running rich

What colour is the exhaust smoke?

When you stand behind the car with the engine running after the engine is fully warned up, do you see smoke coming from the exhaust?

The engine is running very rich that is why the exhaust is emitting black smoke. The engine needs a tune up so the air fuel mixture is correct.

could be anything best bet change catalytic convertor could cause loss of power car not breathing properly poor acceleration,fuel consumption,hesitation etc..

i had this problem and thought the fuel filter oil filter needed replacing so i have just had a service done but problem is still there but not as bad. been told it could be the AGR valve or a split pipe going to it which recuirculates unused fuel back to burn again. therefore unspent fuel is coming out of the exhaust causing the black smoke. i am still looking for the answer aswell, hope this helps.