hi, question for the diesel experts. My Kangoo 1.9D has started to produce black smoke over the last few weeks. Starts perfect whatever the weather and runs perefct up to half throttle then starts to smoke increasing as more throttle applied, worse under load up long hills. I ran thru a series of checks such as new air filter, fuel filter, cat clear. Egr was replaced by previous owner 6 months ago and is checked and working fine. I then took it to local diesel specialist who checked for fault codes and found none. Their suggestion was injectors or injection pump but thought more likely injectors because it ran and started so well. I got 3 secondhand injectors FOC and swapped them around hoping to get lucky but no change at all. My injectors were very sooty on the area just up from tip whereas replacements were perfectly clean. Is there a seal under end of injector and if these have failed could this cause the smoking ? Finally i have seen pump overhaul kits advertised and wondered if pump would need to be recalibrated afterwards if i just did seals ? It has the Lucas Epic pump. Thanks in advance and apolgies for the lengthy question.