Ok a while back I posted a thread about my injectors not firing. Here's what's been done to the car. It's a 91 Z28 TPI 5.0 camaro, when I got it it needed a fuel pump and body work, the pump was hotwired to a fuse. I replaced the fuel pump and got the car running, even did a burnout, but I found out the bearings were pretty much gone on the car (from b4 I did the burnout it would make the noise) then I changed the oil and it made it all the time. So I pulled out the engine, put new rod bearings and timing chain, threw it back in, reconnected everything, had to replaced the fuel pump 3 times cuz it sat like 3 months each time, 3 for motor, 3 after I took it to a guy to help with the electric work but we never got to working on it. and 1 from when I got the car.

I have a new fuel filter, new fuel pump (100% working, I hear it buzzing and I have fuel in the fuel rail)
I accidently connected a wire from the battery to another yellow wire coming from the fender (I'm almost completely sure it was yellow), and it melted like it does when something is shorting out. Then when I threw in the engine the injectors wouldn't fire. We started the car up by spraying gas into the air intake, and the motor runs great, sounds badass, but it won't keep running cuz the injectors won't fire. I figured I fried the computer or that we didn't connect a ground wire to the back of the block, we checked them but they seem to all be there, I might need to check really really good once again. I figured I fried the computer so I just bought a new one and put it in with the PROM (Chip) from the old computer, but still nothing, no check engine light, no nothing. Omg! I think I just figured it out!!!!!!!!!!!! maybe..... Today we took the computer off and checked if the connection was getting juice to the computer and when I had the test light on a ground and to one of the pins that connects to the computer, it lit up the check engine light. So maybe it is a ground wire that is not connected!!!!!!!!! I hope... Well also we checked the ECM fuse and it's good on both parts of the connection it has juice. So it's some ECM problem but I have no idea why the injectors don't open. What could it be? Maybe that ground?


Here's what is working:
Fuel in fuel rail
Fuel pump working
Brand New computer with PROM(chip) from old computer
Spark plugs and wires
Distributor
Motor (minus injectors opening)

And 1 more thing, the motor ran and fired all 8 injectors before we pulled it and before that wire got fried.

Ayuda me (help me) ppl. Help me bring this Z28 back to life, or it's carburetor or nothing or this blue camaro.

 

Does anybody know which of the wires for the computer goes to the ground?

 

mine did the exact same dang thing, this took me like 3 days to figure out. mine is an 88 iroc LB9. mine had another fuse, dont ask me what it is technically named,but it is at the end of two wires with a rubber cap on it. mine was tucked behind the battery on the passenger side,(yours may be in different location, but i have seen them on other tune port camaros so it is factory) . i replaced the blown 10 amp fuse and check engine light came on with the key then fired right up

 

Ok, there is no fuse near the battery. I've narrowed it down to 3 things. 1st my computer doesn't have a working ground on the white wire. And when I jump the ground to the green and blue injector wires (green is for 4 injectors, blue for the other 4) the car sprays the injectors and the motor starts now. Butttt I'm afraid if I hold down the ground the injectors will stay open and flood. Someone who looked at it told me there is no message being sent from the distributor to the computer, but he also told me just to tap the ground wire to the injector ones because it has to send a pulse (on, off, on, off...) So I believe that message has to do with the timing in the distributor ignition module cuz that is the part that goes from the distributor to the computer. I just found out the key chip is good, so it's either 3 things. Computer chip is bad (I used the prom from the last computer), #2 There is no ground for the injectors, or #3 the ignition module is bad and its not sending to the computer or computer not sending to it. Another thing I might add is that when I put a ground to the white wire of the computer, the injectors still won't open and I heard that white wire is the ground for the injectors. Please help! What could it be? Does the ignition module effect the injector fire or the computer from working? I also read that the computer and distributor have a common ground, but my distributor works and it has a good coil with that short spark plug wire going to the middle of it from the coil, so I'm thinking maybe the distributor works because it's connected with a different wire, but the computer doesn't work cuz that piece (ignition module) is not working to send the message or recieve it. HELLLLLLLLLLLLLLPPPPPP!