Why would a 96 Pontiac Grand Am start by itself and the only way to turn it off is to disconnect the battery?

Answer 1

*Another possible reason* if you are not using the original key to start car ... some duplicate keys not made by dealer or locksmith ... can keep ignition engaged this happened to me and I would have to disconnect the battery terminal to kill engine. the igintion switch is bad,go to your closet jonk-yard and buy a igintion switch here is how to replace it REMOVAL & INSTALLATION Disconnect the negative battery cable. If equipped, disable the SRS system. Detach the left instrument panel insulator. Remove the left instrument panel trim pad and the steering column trim collar. Unfasten the steering column upper support bracket bolts, then remove the support bracket. Lower the steering column and support it safely. Disconnect the wiring from the ignition switch. Unfasten the ignition switch-to-steering column screws. Remove the ignition switch from the steering column. To install: Before installing, place the slider in the proper position (switch viewed with the terminals pointing up), according to the steering column and accessories: Standard column with key release—extreme left detent Standard column with PARK/LOCK—1 detent from extreme left All other standard columns—2 detents from extreme left Tilt column with key release—extreme right detent Tilt column with PARK/LOCK—1 detent from extreme right All other tilt columns—2 detents from extreme right Install the activating rod into the switch and install the switch to the column. Do not use oversized screws as they could impair the collapsibility of the column. Connect the wiring to the ignition switch. Adjust the switch, as required. Install the steering column. Fasten the steering column trim collar, instrument panel trim pad and insulator. If equipped, enable the SRS system. Connect the negative battery cable and check the ignition switch for proper operation. you can go to AUTOZONE STORE TO HOW TO REPLACE IT