Hi to all!. Ive got an 88 firebird 5.7 T.P.I that will not start. I have great fuel preesure/volume and spark. Problem is I have no injector function. Put a noid light in and I DO have pulse but injectors dont work. Removed rail and injectors to see if I got some debris/bad fuel in the rail. Nothing. While out I cleand and bench/flow tested each injector. All had great flow and pattern. Reassembled to continue testing. Like I said, have pulse via noid light however I have 12 volts on BOTH sides of each injector connector. Shouldnt one side be grounded (pulsed) via the PCM? Isnt that what gives them their "pulse" and makes them work? Am I reading the schematic wrong or missing something? I am not a dummy around cars or electrical but Im at a loss. Perhaps Im just over thinking it at this point and am overlooking the obvious but I am at a loss. ANY help/insight would be greatly appreciated. Here is a list of what we've got. Thanks to all.

NO CODES, GOOD FUEL PRESSURE/VOLUME, GOOD SPARK, WILL FIRE OFF ETHER (wont stay running, obviously), TPS, IAC AND IGNITION MODULE NEW(er) AND TESTED-GOOD (not changed for this issue), ALL INJECTOR CIRCUITS TESTED (several times) - ALL GOOD - NONE OPEN/SHORTED, ALL INJECTORS OHM AND FLOW TESTED - ALL GOOD.

 

the ecm grounds one side to pulse the injectors. do you have spark? you might have a icm or pickup coil issue or it might be a vats issue.

 

mine did this same thing. i just happened to flex the ecm (computer that holds the PROM chip, under passenger side dash) with two hands and noticed things clicked in the engine bay (note: i had the key in the on position still)...when i flexed it so things clicked and turned the key it would fire up then die when i let go of the ecm. i replaced the ecm and it started no problem. this might be worth looking into.