Helped out the neighbor lady works at the hospital her car would not start last night. Picked her up and told her it sounded like a dead battery. Went up this morning with my jump starter and it turned right over and ran fine. Got it to my place and tested the battery and it tested bad. Jumped it again and ran it to the car quest and they tested it as bad. Since I shut it off it would not start so jumped it off the new battery and drove it home. Put in the new battery and it turns over sputters and dies, tried several times and no luck. Never had any thing like this happen 2005 Buick Lacrosse, Any ideas?? Ran fine after jumping it on the old battery and drove it about 20 miles ran perfect, not sure why putting in the new battery would do anything to it. I was careful putting it in no arcs or pulled wires and like I say it turns over but wont run.

Double and triple check the battery connections, clean and tight. Any way to test the new battery? I've seen plenty of them bad out of the box.

Sounds crazy but my 2002 Tundra did that after changed out a bad battery. Had to turn on the AC as that tells it to high idle. Then drive it for at least 5 miles. It was said it had to relearn the new battery.

Battery change

If don't work google it for your make and model.

Possibly the adaptive learning tables in the PCM are all messed up. The PCM learns values for fuels and spark, and stores them in a memory that can get messed up or erased. Bad batteries can cause all sorts of havoc. Try disconnecting the battery, leave it for a minute or so, and reconnect it and see what happens.

will try what has been suggested

Pulled the cables and making sure the new battery is fully charged Im thinking loosegoose might be right sounds like a flippin computer issue.

A couple years ago a buddy and I were going turkey hunting. All of a sudden we are down to 5 mph. It was a Sunday so nothing open. I remembered my old laptop would freeze up and the only way to restore it was to pull the battery. So.....we disconnected the battery for an honest 15 minutes. Hooked it back up and all was well. Need to give the computer time to clear its memory.

Don't ya'll wish it was the 70's again,....so you could jump in the engine compartment , sit on the inner fender wall and actually work at an engine and find the problem

No Woodtick, I don't wish for vehicles to be like they were in the 70's. Brakes, hoses, belts, and shocks lasted maybe 20k miles. American made cars were crap. Being able to work on one I do miss.

Don't take 15 minutes to clear my memory-all I have to do is walk down to the basement. then the wondering starts..........

thats my point Edp, Being able to work on one I do miss

Fully charged battery new cables and tight unhooked battery for over an hour just turns over lots of battery juice just wont fire.

Possibly a security issue. Does she have any other keys?

I would put the old battery back in, try to jump start it again, and go from there.

I reckon there aint no gas in it.

Wouldn't that be funny. Reminds me of a story.

I was about 11 or 12 years old and my grandfather was working on a boat motor. He was a really good shade tree mechanic. He had this motor in a 55 gallon barrel of water to work on it, with a hose going down into a gas can to supply the fuel. He spent over a week and no matter what he did it wouldn't run and he couldn't figure it out. I shadowed him around a lot as a kid, and I was out there with him and he was grumbling about how he couldn't figure this stupid thing out. My eyes fell on the gas can and I said, "Grandpa, isn't that the Kerosene can?" He looked at me real funny, then walked over, yanked out the hose, and smelled it. Fired right up when he put the hose into a can that actually has gas in it, lol.

Full tank of gas tried jumping it and charged the battery again no luck guess time to have it towed to a mechanic. Best guess is computers out of wack from battery going dead

Sounds like you need to reset the Anti-Theft system. Look it up in the owners manual. You could try locking all the doors and unlocking with the key fob or unlocking the drivers door with the key. Sometimes it's that simple,as I said lookit up in the owners manual or try Google.

Turned out it was a fuel pump relay! Not sure why it picked the time to go out right after I changed the battery but it sure through me off! Thanks to all that helped with my questions nothing like more motor heads to solve a problem.

Glad you got it sorted out.