how to fix P0300 random misfire code in my Toyota Tacoma N300 (2016-Present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, vacuum gauge.
• Safety Warnings: Disconnect the battery before working on electrical systems.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover if applicable.
• Unplug the ignition coils and remove them using a socket.
• Remove the spark plugs using a spark plug socket.
• Inspect spark plugs for wear; replace any that are fouled or damaged.
• Ensure the new spark plugs are gapped according to manufacturer specifications (typically around 0.044 inches for Tacoma).
• Reinstall spark plugs and ignition coils.

3. Check and Replace Ignition Coils

• Using a multimeter, test the resistance of each ignition coil.
• Replace any ignition coils that are out of specification.
• Install new ignition coils, ensuring they are seated properly.

4. Inspect Fuel Injectors

• Remove fuel injector connectors and fuel rail if necessary.
• Check for clogs or leaks in fuel injectors.
• Clean or replace any faulty fuel injectors.
• Reinstall fuel injectors and connectors.

5. Check for Vacuum Leaks

• Inspect vacuum hoses and connections for signs of wear or damage.
• Use a vacuum gauge to test the intake manifold for leaks.
• Repair or replace any damaged hoses or gaskets.

6. Perform a Compression Test

• Remove all spark plugs.
• Insert the compression tester into each cylinder and crank the engine.
• Record the compression readings; they should be within manufacturer specifications (typically 170-190 psi).
• Address any cylinders with significantly lower compression.