Black smoke when accelerating

Black smoke means the vehicle is running really rich , do you know what that means ? lacks power when accelerating could be plugged catalytic converter . Fouled spark plugs . Leaking , fuel injectors , fuel pressure regulator leaking .Air filter clogged .Hooking up a scan tool an checking fuel trims , seeing if the computer is taking fuel away or adding .Seeing what the computer is seeing
Why black smoke coming from my car engine Troubleshooting 1 Must Watch

If the smoke is black , the mixture is too rich. If it's white and disappears soon after accelerating, then it's valve stem seals.

Hi. I suggest you fix the misfire first. Most likely an ht lead or coil.

try rebuilding the carb nd or tune up on engine

I assume you mean exessive smoke?
White smoke = watersteam - usually cracked cylinderhead gasket
Replace gasket
Black / dark smoke preferrably visible when accelerator is let up after acceleration = oil - usually enters the cylinders through worn valve seals.
Repclace seals (can be done without lifting cylinder head)

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.

What colour smoke is it..... if its Black then the pump is over fueling so both pump and injecters need doing.
But if the smoke is BLUE then you have engine problem like Rings or Valve guides etc
so lets hope you have BLACK
Have a good day

Black smoke from exhaust means engine is getting to much fuel

Black smoke is almost always an indication that the air/ fuel mix (ratio), is too rich. I would try to find out if the just cleaned the injectors or were they replaced. Cleaning injectors and sometimes leave irregularly shaped orifices. Besure the air filter is clean. This can effect mix also.
Good Luck and hope this helps.

can anyone tell me where the intercooler is on a 05 plate jaguar x type 2.0 diesel thanks