I have a 95 Z28 here that I cannot get an injector pulse on. It will not start because of this, but I have been able to get it to start by squirting some fuel into the intake.

I have made sure that both grounds coming from back of PCM for the injectors are good. (Black/ White) and (Tan/White). I also read about checking the Purple/White wire.

I checked this wire at the connector spot near the passenger side valve cover. I probed both sides and found 5 volts. I tried this several times and got readings in the Millivolt range other times. I'm assuming when it hits 5 V its sending the signal to fire (must be TDC)?

I also checked this signal at the PCM and found same readings in the millivolts.

I manually jumped from before that connector to the PCM (purple / white) to see if there was a break in between, but that was not it.

I manually grounded the other ground wire (forget the color) at that connector, and that did not do it either.

Also please note I have switched the PCM for a known good one and that did not cure it. I also replaced the opti and coil/ignition module.

Any other ideas guys? What can I do next?

Thanks,
Bob