C8 2.2 hdi misfire and black smoke when warm.

2005 Citroen C8 2.2 hdi
Car: Citroen C8
Year: 2005
Variant: 2.2 hdi
Categories: Running Rough, Starting & Power Loss
The car drives perfectly for about the first 20 mins then when accelerating above 3000 rpm the car starts to misfire and black smoke comes out of the exhaust. This continues to get worse and starts at lower revs until the engine light comes on and the anti pollution fault is displayed. Any ideas?
Problem added: Aug 17, 2015 (8 years ago)
First thought would be a faulty injector.
or possible valve problem in the head.
Scan it,
and leak back test on the injectors.
Though the scan might reveal an injector correction value.
Scan first.
Answered Aug 17, 2015 (8 years ago)

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