Problem with theft system on pontiac sunfire 1997, it allows the car to start then kills the engine.

Anti-theft system isn't allowing it too .
The Passlock™ System is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate or the ignition switch is operated while separated from the ignition lock cylinder case. If starting is attempted without authorization from the Passlock™ System, the powertrain control module (PCM) will disable engine starting. Start disable may be in the form of fuel disable or starter disable, depending on engine application.
The components of the Passlock™ System are as follows:
• The ignition lock cylinder and key
• The ignition lock cylinder case, including the Passlock™ sensor
• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The powertrain control module (PCM)

The problem is in the ignition cylinder lock.
The body control module (BCM) is what controls the theft deterrent system on the 2000 Pontiac Sunfire.
It can be reprogrammed, but is complex to do.

Here are some pictures for you.
http://www.autofuseboxdiagram.com/4232-2000-pontiac-sunfire-2-2-fuse-box-diagram/

http://www.automotix.net/usedautoparts/2000-pontiac-sunfire-chassis_computer-inventory.html?fit_notes=e1360a49a192739e006f059ad1d62904&seq_num=8

SOUND LIKE YOU FAULTLY WORN IGNITION KEY,FAULTY IMMOBILIZER READ COIL IN THE IGNITION SWITCH OR BCM FAULTY HAVE VECHICLE CHECK OUT AT DEALERSHIP AND FIX YOU CANT DISABLE THEFT SECURITY SYSTEM.

Your vehicle is equipped with the Passlock theft-deterrent system.
Passlock is a passive theft-deterrent systemT. he system is armed once the keyi s removed from the ignition. Passlock enables fuel if the ignition lock cylinderi s turned with a valid key. If a correct key is not used, fuel is disabled.

During normal operation, the THEFT SYSTEM light will go off after the engine is started. Ln the unlikely event that the engine stalls and the THEFT SYSTEM light flashes, wait until the light stopsf lashing before trying to restart the engine. Remember to release thkee y from the START position as soon as the engine starts. If after several tries the vehicle still does not start, the vehicle may need service. At this time, you may also want to check the fuses. See your Pontiac dealer for service.

If the THEFT SYSTEM light comes on while the engine is running, a problem has been detected and the system may need service. See your dealer for service. In an emergency, call the Pontiac Roadside Assistance Program at 1 -800-ROADSIDE or 1-800-762-3743.

This ans other details can find it in this link for 1996 Pontiac Sunfire - Owners Manual.

I hope helps (remember to rate and comment this).

can u explain more about the thin wire and jump the teminals on the right?? i dont get it,, the deal with my car is , the anti theft light its no blinking just stay on, thank u so much

try relocking your driver door and unlocking wit the key.sounds stupid but this how most security systems are overridden.

Turn the key on, Leave the key on for 10 minutes until the theft light goes out. Turn the key off. Then it should start the next time you turn the key.

Check all of the vacuum connections. The brake booster vacuum line.

Tell the guy to call the dealer and ask them how to override the anti theft system or reset it. when you disconnect the battery and lose power it kicks on the anti theft device and it won't get fire.

i changed the motor and tranny on my gt and the theft system was on. put key to on potion and leave for exactly 5 mins no more no less then the theft light will go out and start it. took me forever to find that out