i would say its the VATS, i don't know if the security light comes from the computer, if it does, you might want to hook one up so to know for sure.
The VATS cuts off the fuel pump, injectors and starter on a normal '95 lt1.

 

Have you heard of any issues with the cheap timer.shop bypass modules ?

 

one i was looking at years ago was $100, this one looks like it does 30hz & 50hz i know 95 lt1 uses 30hz so you might check and make sure its putting out 30hz, because if the computer doesn't get 30hz it will lock out. they say the blue wire has to be grounded so maybe it came loose or not working at all.

 

If you don’t have ignition switched 12 volt power to the pink wire (stock LT1 wiring harness) at each injector, it is not the result of VATS system. There is nothing between the battery and the injectors except the wire, a fuse (actually 2 fuses, 1 for #2/3/5/8 and 1 for #1/4/6/7), and the ignition switch. Key on should show 12 volts on each pink wire. You won’t have a ground present on the other wire, because the PCM supplies a ground to each cylinder in the firing order sequence to fire it. You need a ‘noid light to detect that ground pulse.

There are codes that prevent the PCM from restarting the fuel pump (after the 2 second prime/shutoff), and/or firing the injectors. Have you scanned for codes? One of them is DTC 46 for no fuel enable signal from the theft deterrent module (or bypass module in your case) to the PCM. Absence of the cam position sensor pulse signals from the optical module in the Opti will also shut down the fuel, and set DTC 16.

In any case, the fuel pump should always prime for 2 seconds, then shut down when the key is turned to run, whether the VATS system is working or not. The engine may even start and run for a few seconds on the residual fuel in the rails.

 

It might be obvious after Injuneer's post but I'll mention it anyway. Test the voltage at the injectors using an engine ground, not the other wire on each injector...

 

Okay the injector issue was my own wiring mishap. I didnt have any hot hooked to my harness on either side.Now my fuel is good. New issue she will fire up 2 seconds and die. Still dont know why my ecm wouldnt give power to my fuel pump relay. But now it is. Sensors un hooked are maf, iat, temp, o2. Next step i suppose is hooking up a diag. Will i have codes from the evap and egr being removed ?

 

Are we should 95 is 30mhz ? This whole time i was under the impression it was 50 in 95

 

Did you check for DTC 46? That will tell you if the PCM is receiving the correct fuel enable signal from the bypass module.

Not sure, but I thought 1993 was the last year that used 30Hz.

 

if you google it, you get answers for 30hz & 50hz for '95 so what i would do since your module does both is try one, then try the other, its not going to hurt anything, one will just not work. if i had a frequency meter i would check mine.

 

I have rebuilt another harness to double check each wire. Everything is perfect. Honestly i cannot find a single issue anyehere now. Car still only runs 2-3 seconds. Im not losing fire and injectors are not stopping fuel pressure is stable. I can run all day on spray but only 2-3 seconds on injectors. I ran the motor before the swap and no issues were present. One other thing i noted was it seems to be loading up. She will sputter and bog but i can pull my fuel relay and boom 3 second run time. Im running an external jaguar pump anf thought maybe to much pressure but the regulator should fix that i would assume.

 

I'm not sure on this but i think if the computer thinks one of the injectors is shorted it will shut them all down. i remember a guy's car died on him because of that issue so he just unplugged that injector and ran it on 7 cylinders till he got home. so you could try unplugged each one to if that is the issue. but again if had more than one that wouldn't work.

 

Only the driver for the injector that showed a fault will be disabled, not all of them. Direct quote from the 1995 factory service manual, page 6E3-A-50, covering DTC 18 - Injector Circuit(s):

 

i'm glad that is so i would hate to have my die somewhere because of one injector.
I'm glad we have you 'injuneer' to give us the right answer, ( you know that saying 'if its on the internet its true' )

 

Well, I have found errors and contradictions in the factory service manual, particularly when things change from one year to the next, but they don't catch the changes required in the next year's manual. I am always open to seeing a citation form a different source if there is a conflict.