"I unplug the battery connection under the hood where you place the + " please say you did not disconnect the positive battery terminalwithout disconnecting the negative first. Please.

 

I know at that time I did not disconnect the negative since there isn't one under the hood I can see at least. When I tried charging my battery I did disconnect the negative first then positive to remove. How bad is that? What should I look for?

 

You may have shorted the battery while disconnecting the positive terminal.

 

I realize i forgot to mention when jumpstarted with another car at over 13v it still will not start. I know the battery will need to be replaced but I can't understand why it will not start

 

if your battery is damaged or dead it might not start even with a proper battery on another vehicle...I recall trying to jump start a vehicle that sat and the owner claimed the battery was still good but the battery on the jumping vehicle was good...no luck...when I saw smoke from the connection I got him to stop trying to jump the vehicle that had sat...

a new battery for the vehicle that had sat started it right up and is still working as designed today...

Bill

 

Sounds like the battery had an internal short. It happens. Haven't had one since switching to AGMs.

 

I replaced battery yesterday, it turns out the old battery was too small (600 cca). Hadn't had any issues til now though. It's still not starting with the new battery.

 

Nothing like having proper instruments. Any codes, current or history. Need fire, squeeze, and fuel. Helps to know high and low fuel pressures and whether the plugs are firing in the right order. Can hear squeeze.

 

I have no scan tool but I know someone who does. I just can't figure out why now it won't start since it started before.

 

I tried to check codes but because battery was changed they seem to be wiped. Also since it doesn't start I don't think new ones will be stored. I'm thinking timing chain popped when i started it the one time after. Does that seem probable. I don't remember any click or anything odd though. I hope not but i can't think anything else. I just put the new plugs back in and tried again. I can smell fuel on the plugs and the starter seems to be trying.

 

Try turning the key to the on position without trying to start for about 30 seconds then turn to start. If that doesn't work then put your foot to the floor and try to start. Take your foot off quickly if it does start. If it starts it could be your purge valve.

Roy

 

I don't know about your year of car but on an earlier one it can be a crank sensor which they do talk about in this video:

Roy

 

Was going to have it towed to a shop when I figured I'd try 1 last time, and this time it started. Im not sure what did it but I unplugged and replugged all connections in the engine bay i could've possibly hit them I was pulsing the gas pedal and it started. I still have a misfire but no code because of the battery disconnect. Thanks for the ideas everybody.

 

I was pulsing the gas pedal and it started.

GM is fairly consistent about a lot of things with their cars over the years. I believed at one time, that applying the gas pedal in a fuel injected car was useless, because fuel injection did not work like a carb (Fuel isn't sucked out of them). When I started tampering with engine management code, I discovered I was wrong.

The fueling with pedal input while cranking an FI car works like this; any input while cranking the motor, up to a designated throttle position, adds cranking fuel and usually beyond 75% throttle input, cuts fuel off, resulting in a clear flood crank. Some of you may remember the sticker on the visor of some earlier FI cars that instructed applying the gas pedal during starts in very cold weather if difficulty starting was encountered (denser air needing more fuel).

I believe you may have a fuel pressure/pump problem, or a vacuum leak, or failing sensor related to fueling and/or ignition; MAF sensor, crank position sensor.

 

A good scan tool can check all of those (including low and high fuel pump pressure) except the crank sensor with just the key on, does not need to be running. Can check timing chain just by pulling a spark plug and cranking, compression stroke will be audible.
Guess auto shop is no longer a high school class.