sleeve 801 having a nozzle 802 with a conical outwardly displaceable valve 803 the valve has a spiral stem portion 804 and guide vane portion 805 the valve 803 is biased by a compression spring 806 engaging a spring head 807 the spring head 807 is connected to the end of the valve stem 820 by a split conical seating 808 in a recess on the spring head 807 the end of the valve stem 820 has a magnetic element that cooperates with a sensor transducer 810 to indicate the valve position the stroke of the valve 803 is limited by a slotted bushing 811 contained within outer bushing 812 the injector body 813 is provided with a fuel passage 814 and a supply port 815 an electrical conduct 816 of the transducer 810 transmits a signal responsive to valve movement to the electronic control module for continuous diagnostic control the injector 800 of fig8 has a hollow conical spray pattern 818 as shown in fig9 the injector 900 has the identical components as that shown for the injector 800 of fig8 but with a modified tip 901 of the valve 902 that co acts with a modified chamber in the.