i got a 96 sentra and recently i can't get it start. A week ago the weather was cold and the car has been sitting there for a week. I cannot get it start then and I thought it's the weather, but i tried again today when the weather is warm (in the 50s) and still no luck. I cleaned the terminals and the battery gives out 13.5 V when it's off. When i turn the key, there was some noise which sounds like it's trying to start but just not quite enough juice or whatever it is. The battery is only 6 months old and the alternator is 4 months old, it was a remanufactured one but it should last longer. I haven't tried a jump yet, but the voltage of the battery seems normal. what the problem would be? maybe the starter or spark plug or something else? Thanks!