1. Check the fuel system. Make sure the fuel tank has fuel in it and that the fuel pump is working properly. You can check the fuel pump by turning the key to the "ON" position and listening for a humming noise coming from the fuel tank. If you don't hear a humming noise, the fuel pump may be faulty.
2. Check the ignition system. Make sure the spark plugs are properly gapped and that the ignition wires are in good condition. You can check the spark plugs by removing them and inspecting them for wear and tear. If the spark plugs are worn or damaged, they will need to be replaced. You can also check the ignition wires by looking for cracks or breaks. If the ignition wires are damaged, they will need to be replaced.
3. Check the starter. Make sure the starter is properly connected and that it is receiving power. You can check the starter by turning the key to the "START" position and listening for a clicking noise. If you don't hear a clicking noise, the starter may be faulty.
4. Check the battery. Even though you just replaced the battery, it is still possible that it is not providing enough power to start the engine. You can check the battery by using a voltmeter to measure the voltage. The battery should have a voltage of around 12 volts. If the battery voltage is low, it will need to be recharged or replaced.
If you have checked all of these things and your car still will not start, you may need to take it to a mechanic for further diagnosis.
