it could be the vats security if you turn ignition switch to on and security light stays on the wire in the ignition lock is broken or if it is a automatic could be safety switchAnswerGenerally, when the engine won't turn over, it's a battery problem. If you hear a clicking sound when you try to start it, that's your solenoid and the battery is most definitely dead. It could also be the starter motor has gone..but the easiest way to tell is to check the battery for voltage first.
.AnswerOn the 1986 and later GM cars there is a potential intermittent start problem that is linked to a computer failure (ECM). It is talked about in Chevy Bulletins. It can also cuse battery drain. The fix is to replace the ECM. I had the same problem with an 88 Blazer. Cost is around $125.00. Also the same intermittent start problem can be had because of the ignition switch. It is also covered in Chevy bulletins and requires the replacement of original switches and keys with newer ones that have a more narrow key way and insure reading of the resistance in the security "pellet on the key itself. Cost is around $50.00 for the switch and $30.00 per ignition key. Remember that once the ECM is replaced then you should have the shop scan for fault codes and get them cleared. Funny things such as uneven idle can happen and even the throttle position sensor will need to be reset. ajcampagnakfpd@AOL.com 4/18/2005