1. Check the battery connections: Make sure the battery terminals are clean and tightly connected to the battery posts. Loose or corroded connections can prevent the battery from providing enough power to start the engine.
2. Check the fuel supply: Ensure the fuel tank has enough gas. Also, check the fuel lines and connections for leaks or blockages. A fuel filter clogged with dirt or debris could restrict the fuel flow to the engine.
3. Check the spark plugs: Remove the spark plugs and check their condition. Look for signs of wear or damage, such as eroded electrodes or cracked porcelain insulators. Replace any faulty spark plugs.
4. Check the ignition coil: The ignition coil supplies the spark plugs with the necessary voltage to create a spark. If the ignition coil is malfunctioning, it can prevent the engine from starting. Test the ignition coil according to the vehicle's repair manual.
5. Check the starter: The starter motor engages the flywheel and cranks the engine. If the starter is faulty or its connections are loose, it can prevent the engine from starting. Check the starter connections and test the starter according to the repair manual.
6. Check the Engine Control Module (ECM): The ECM in your Tercel controls fuel injection, ignition timing, and other important engine functions. If the ECM is malfunctioning, it can prevent the engine from starting If you suspect an issue with the ECM, it is best to have a qualified mechanic diagnose and repair it.
It's essential to thoroughly inspect each component and consult the vehicle's service manual for specific testing procedures and specifications pertinent to your 1987 Toyota Tercel.
