I've disconnected the factory alarm system,it would shut the engine down after driving. I've jumped the key side and motor side of the starter contacts that were unplugged from the alarm. the car will start and drive, but now on after a few days or a week it turns over but no spark and will not start, but if I disconnect the battery for a while , then it will start and run. any suggestions?
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Unfortunately if you are referring to the factory anti-theft system - it will have to have computers replaced. Once the Engine Computer sees a Theft Alarm request it will remain there forever and it will shut down the fuel system until seeing an OK To Start from the Theft Alarm.
If it is after market alarm - find it and disconnect wiring - restore connections to original
does that help?
If you are having trouble with the system? Make sure the battery is good and fully charged. There are entry switches on the back side of the lock cylinders on both front doors (probably knocked off when the door is "Slim Jim'd") and the trunk lock.
If your battery is dead and you try to jump it - you will have to turn off the alarm again after hooking up the jumper
try resetting alarm lower drivers side window and take out keys,disconnect battery and fully charge it , when you reconnect battery alarm will go off ,put key in drivers side door and turn key all the way open and all the locked 3 times then remove key that should reset alarm.
factory security does not have toggle switches as far as I know so it is probably an aftermarket system. Try one of two things, turn the toggle switch the oposite direction with battery disconnected. Reconnect the battery and try again, the horn will beep a few times when you reconnect. try starting. If that doesn't work, disconnect the battery and turn the key to the on position and reconnect the battery and the horn will sound but will go off get in the car and try to start. It should start and run normally. shut car off, then you should be able to return the toggle switch to the previous position If this happens again turn the toggle switch to the opposite position with the batterry disconnected and turn the key switch to the on position and reconnect the battery and start when started go see a service that installs aftermarket systems and they should be able to reset it security system Hope this helps
If the after market alarm system isn't completely removed from the vehicle and the car restored back to where it was prior to the alarm, the alarm system will think someone is trying to steel the car and has shut down the signal from the PCM.
The alarm needs to completely removed.
Once the alarm has been removed, I would use a GM ignition key, you may need to tow the car to your local GM dealer to make a new ignition key and program the key to match the PCM, it's possible the vehicle ant-theft system has shut down the electrical because of the incorrect ignition key.