The car is a 1995 Grand Prix with a 3100 engine.
I have been working on this issue for about a week now. I will start at the beginning.
I read in the forums about an issue with the "O" ring failing on the unused distributor opening on the engine, causing an oil leak on the top of the engine. Well I figured that would be an easy one to fix, until I tried it.
The first thing I did was to cover the fuse boxes and the computer in the engine compartment with plastic, to avoid any major water getting into these. Next I decreased the engine, then with my pressure washer set to low pressure, I cleaned the engine. After waiting about 1 hour after the cleaning. I started the car and drove it to the front where the garage was. It died before I could get it into the garage. Thinking it could just be a little wet, I pushed it into the garage and started the procedure to fix then "O" ring problem. It took a while figuring it out but I think I did just fine.
I put it all back together knowing I had fixed that problem.When I tried to start he car it would turn over, but not fire. So I checked for spark at the plugs, which I had, so I moved on to fuel.
To check the fuel, I installed a gauge on the fuel rail, reading 42psi, which is good for this engine. Just for good measures I replaced the fuel filter. I tried to start again, nothing. Well I gave it a small shot of starting fluid to check to see if it would try to start, and it does. But then dies. I checked for voltage at the injectors on the red wire, of which I have 12 volts. Do they switch the ground on the injector to pulse fuel into the block?
Thinking about the problem, I have fuel, I have spark, but I didn't think that I was getting the signal to fire the injectors. So I started investigating problems for that. I ended up replacing the cam position sensor, thinking this is the timing mechanism for the engine. Well that did not change anything, it still turns over, but will not fire. Again I gave it a shot of starting fluid and it tried to fire. I have checked all the fuses in all 3 fuse panels, all are good.
I went through most of the electrical connections, reseating them and adding a little DI-electric grease to the terminals. Nothing changed.
Now I am wondering about the passcode theft deterrent system the car has. It has a key with the resistor built into the key. I thought maybe I somehow changed the resistance in the system. I tried the, turn on the key for 10 minutes, turn off, and then retry to start. Still having the same results.
At this point I am at a complete loss as to where to start the next phase of the troubleshooting process. I do not have access to any of the technical manuals GM mechanics have for troubleshooting purposes. Any one have an idea where to go from here.
