When you say not start, do you mean doesn't crank or does nothing when the key is turned? BClear.
For cold weather goto a low vic oil (ex. 5-30), clean/new plugs, fuel is clean - no water and choke system is working.
If you unplug the battery is for sure is not going to start. What are you asking?
Check your battery connections. If they're tight and no corrosion is present, then your battery may be dead. Recharge or jump start the battery. Still clicking? Replace the starter.
starter, solonoid, ignition, battery. if it clicks when you turn the key then the battery is really dead or its the starter the battery could still be jumped if its the battery.
That could be the alternator or the battery. Try jump starting your car with another car's battery. If it still does not start, it is probably the alternator. If it starts, your battery is dead.
Make sure connections are on tight.
the battery job is to start the car so the alternator will kick in after the car is running
Tune up, plugs, wires, fuel filter, truck still will not start outside in 15 degree weather
Sounds like a dead battery. You need the battery to start the car, but once it is running the engine runs completely off of the alternator (which also recharges the battery if the battery is still good).
You need all the cranking amps your battery can supply in cold weather. Check your battery connections, take them off and clean them and reinstall and tighten. You can use dilectric grease to keep them from corroding. Once you have them reinstalled, and TIGHT, then try to crank it over in cold weather. If it still won't crank then your battery has a weak cell and is probably on it's way out. Make sure you have a fully charged battery when you are trying to start it. Warm weather does not take as many crankign amps from your battery so that is why it is fine then and not in cold weather Also check your automatic choke or throttle body position, the flap should be almost closed when starting in cold weather, as a test disconnect the air intake tube from the throttle body and cover the opening with your hand while someone turns the engine over, if it fires right up then that is the problem, never use the gas pedal when starting cold it defeats the purpose, you need to starve the engine for air when starting in cold weather.
check your battery then the connections if it still wont start try changing the starter solenoid if possible
check for loose connections
Yes, but there may not be enough power to start the engine.