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My feeling is the wire is damaged causing an intermittent fault. If you take a trace and the needle value is there then clearly a wire has reattached in my opinion. I guess if the needle had jammed it might give a similar reading but I thought the tolerance was so tight on that needle that not a lot could get in. Never had it apart though so I could be completely wrong. Be interested to hear what @wammers thinks.
If he goes to EDC/ Inputs/Fuelling he should see. Injection set point degrees. Injection actual degrees. And modulation %. Injection actual degrees should be within .5 of a degree of set point degrees. As throttle is increased these values, set point actual and modulation will change slightly. Modulation will change slightly to overcome the extra pump internal pressure as it rises with pump RPM. Thus maintaining the actual injection degrees within .5 degrees of set point. On his print out actual injection degrees reads 0.00, that would indicate to me that no signal was being received from number four injector. If the number four injector fails the ECU uses presets to run the engine and puts the system in limp mode. I would think the changes in modulation noted after the number four injector had been re fitted were because it was giving no signal and due to the presets being applied by the ECU. He now needs to read these values and ensure they do as they should. If modulation is high, at or around his previous 94 %, then the static timing will need doing to return it to 45 to 55 % at idle warm engine. As the static is retarded. I would favour a bad connection rather than dirt in the injector.