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

Solution

1. Preparation

• Gather tools and components needed for the repair.
• Safety gear: gloves and safety glasses.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plugs

• Remove the engine cover if applicable using a socket set.
• Disconnect the ignition coils from the spark plugs.
• Use a spark plug socket and ratchet to remove the old spark plugs.
• Check the gap on the new spark plugs and adjust as necessary (typically 0.044 inches for Tacoma).
• Install new spark plugs and torque them to the manufacturer's specifications (typically around 13-16 lb-ft).
• Reconnect the ignition coils.

3. Inspect and Replace Ignition Coils (if necessary)

• If ignition coils were found faulty, remove the bolts securing the coils.
• Disconnect the wiring harness from each faulty coil.
• Install new ignition coils, ensuring they are seated properly.
• Torque bolts to manufacturer specifications.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, use a fuel injector cleaning kit or replace them.
• Remove fuel rail assembly if necessary to access injectors.
• Install new fuel injectors and ensure they are seated correctly.

5. Check and Repair Vacuum Leaks

• Inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum hoses.
• Use a smoke machine or carburetor cleaner to detect leaks around the intake manifold.

6. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and check if the fuel pressure is within specified range (usually around 30-50 psi).
• Replace the fuel filter or fuel pump if pressure is below specifications.