Not enough information. If the starter runs and the engine turns over easily but doesn't start, it's not any of those things. If the engine turns over very slowly, then the battery is weak. This could be a bad battery, it could be weak due to a failed alternator that isn't charging the battery, or the battery and / or starter cable connections are simply corroded and have high resistance which gets worse the colder the weather is. So clean your battery connections first to be sure there is good electrical contact. If that doesn't help and the battery is weak, get it charged and then tested. It isn't expensive and if it fails the test, replace the battery. If the car starts and runs, get it to any auto parts store and they will test the battery condition and alternator output for free.
If the engine turns over ok but the car won't start, get a can of starting fluid (ether), remove the air filter, and have someone spray it in the intake while you crank the engine. If it starts and dies, keep trying but don't run the battery flat. If it doesn't start after a few attempts, you may have something as simple as water in the gas, or fouled spark plugs that need cleaning, or it could be a bad MAF sensor, a faulty cold start solenoid, or even a failed fuel pump, but not even knowing what kind of car you have it's impossible to say.
A basic clue about cars. Get one. Life will be easier and cheaper if you do.
· 2 years ago