I have a 1999 Cadillac Sts Seville
Recently i started having problems in which the car would not start.I can still hear the cranking and when i acually turned it on with much difficulty but it sounded like a tractor.I checked the battery and it's still good. Yesterday i started up by quickly removing the positive screw and screwed it back and quickly turned the ignition which turned the car on. I drove about 10 miles later and upon entering my driveway again i turned off my car and tried to turn it on. I have a feeling that the Anti-theft system is messed up or there is a short somewhere. Can you guys give me any clue to what is happening or should i bring it in for sevice at my local dealer?

 

My wife has a '99 STS. She had that problem once. But I believe if it's a security system problem it won't even turn the starter. I could be wrong about that though.

The keys have some kind of transmitter in them thatis good for about 10 years, I read somewhere. We went to a locksmith thatcould program the car to accept the new keys. We got two new keys for $40 each, I believe. Haven't had the problem since. If you want your keys to say Cadillac on 'em, you may have to go to the dealer.

Got another remote on ebay too. Need a Tech II tool to program that, cost $38 at the dealer.

 

Sounds like battery or starter, how did you test battery?