Fuel injectders ,not opening up

1 : If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.

2: If the injector does not operate when the engine that is hard to start is cranked, the following as well
as the injector itself may be responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
(2) Faulty MFI relay
(3) Faulty crankshaft position sensor, camshaft position sensor

3. If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut
one after another during idling, make following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check

4: If the injector harness and individual part checked good but the injector drive time is out of
specification, the following troubles are suspected.
(1) Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance

if you need more info, you can download the fuel system service manual from my mediafire account. 3000gt fuel system FSM