1. Fuel Supply:
Make sure that the fuel tank has enough gas and is not empty. Check the fuel filter to ensure it is not clogged. Also, verify that the fuel pump is working correctly.
2. Spark Plugs:
Check the spark plugs to see if they are properly gapped and if there is any damage or buildup. Replace the spark plugs if necessary.
3. Ignition System:
Inspect the ignition coil and ignition distributor for any signs of damage or corrosion. Test the ignition system to ensure it is functioning properly.
4. Air Intake:
Check the air filter to make sure it is clean and not blocked. Clean or replace the air filter as needed. Also, inspect the intake manifold and throttle body for any obstructions.
5. Sensors:
Check the various sensors in the engine, such as the oxygen sensor, coolant temperature sensor, and mass airflow sensor. Ensure that these sensors are functioning correctly.
6. Timing Belt:
If the timing belt is worn or misaligned, it can prevent the engine from starting properly. Check the timing belt and ensure it is in good condition.
7. Security System:
If your Celica has an immobilizer or security system, make sure it is functioning correctly and not preventing the engine from starting.
8. Electrical Connections:
Check all the electrical connections in the engine bay to ensure they are clean and secure. A loose or corroded connection can cause starting issues.
9. Engine Compression:
Conduct a compression test to check the health of the engine's cylinders. Low compression can prevent the engine from starting.
10. Starter Solenoid:
Check the starter solenoid to ensure it is functioning correctly and engaging the starter motor properly.
If you have checked all of these items and the problem persists, it is recommended that you take your Celica to a qualified mechanic for further diagnosis and repair.
