Hello everyone, I have an ex-tpi 350 (which is now a lt1 intake 383) which will not start on its own. The only way this engine will start is by shooting a little bit of fuel into the intake, once I do this it fires up right away and runs fine. When I have it on the "key on" position the injectors have power, once I crank it over there is no power to the injectors!? Fuel pressure is o.k, timing is o.k, the vats has been deleted, the cold start has been deleted('88 vette engine and harness by the way) I am totally stumped!! any suggestions would be great!! Also, the maf is hooked up to the harness but not installed, I am having problems connecting my old intake bellow the the maf sensor.

 

Either the ignition switch is failing, or the injector power somehow got inadvertently wired to the ACC portion of the switch instead of the RUN/START position contacts. If the wiring is all original, I'd start by diagnosing the switch. Since you have no injector power while cranking, you simply need to determine which it is.

If you had power but no injector pulses, I would suspect a VATS problem, but since the injector 12V supply itself is lacking, that shouldn't be an issue.