I seem to have lost power. I notice the lack of power on hills and the pick up does not seem as good as it used to be. The car runs OK even with a ton of sand or gravel in the back but when I tow a caravan the car overheats after about 30 miles/50 kilometres and on hills quicker. On start up I get some black smoke, I have had the injectors serviced that did improve the smoke on start up. If it was a petrol engine I would be more sure diagnosing the problem but with diesel’s I don’t have enough experience to be confident of a diagnosis.
Your help would be greatly appreciated, Thank you