[kingspoint]

I have a 1983 Porsche 928s , ran perfect for years , has been garaged for a while was not running , recently I got back to the car would not start at all, cranks but does not run, I placed fuel in the system manually and it started instantaneously ran for a few seconds shut down, I tracked the relays for both fuel and L Jetronic replaced them both with factory originals , still no start, I replaced the L Jetronic control unit and rechecked , still no start , adding fuel at air intake starts car immediately and it will idle as if fine tuned until gas is consumed , then shut off . I checked injectors for pulse and have none , the injectors light up with ignition on but when cranking they do not blink at all , I checked under the vehicle and located a broken wire to the oxygen sensor , but do not think this would interrupt the fuel injection system . any ideas of what could be wrong , I think I covered all aspects of fuel system and ignition system, ignition system does prove out as car will immediately start with fuel added manually . Could the distributor pick up wire be a cause for failure , it appears the distributor has spark to the plugs but no signal to the injectors ?? anyone have any ideas ??