The number four injector measures start of injection point the signal from it is sent to the ECU. The ECU then compares TDC position from signals received from CPS and start of injection point from number four injector and modulates timing solenoid to correct injection timing. What is the timing modulation should be between 45% and 55%. If it is way high it means the chains have stretched and static timing is retarded, fault one maybe timing solenoid not having sufficient travel left to correct point of injection. That will make MIL lamp flicker or come on. If you have removed innards from stop solenoid, you will have horrendous issues if the quantity servo feedback fails and you get a runaway engine, which will more than likely destroy itself. The stop solenoid is the emergency back up to the quantity servo which stops the engine under normal conditions by setting fuel to zero.
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