Hi, I have a jaguar X-type 2.0d which smokes badly on cold start-up, it's defo diesel smoke. if I disconnect the power supply to injector 1 it runs on 3 cylinders but when I disconnect injector 4 power supply it doesn't alter the running of the engine. Changed diesel filter, EGR valve, turbo and heater plugs. ECU has no stored faults and the injectors have been replaced. any ideas? thanks in advance.