Initially what was the issue with the car prior to the repair?
Have all 4 injectors been reconditioned or brand new and programmed?
Does the car run ok or missfire etc?
What have the garage said about the issue above?
Ok...White smoke is too much fuel so the injectors must be overfuelling...Have they had the injectors programed correctly that could cause issues like that..you need to ask if thats was done or not and what they used to that...Im not sure exactly why if washers where replaced the car failed to start..unless the system hadnt been bled properly..what about fuel pressure has that been checked? Id say its either the injectors are poor quailty or not programmed correctly