how to fix P0301 misfire code on my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the engine cover if applicable.
• Use the spark plug socket to carefully unscrew and remove the spark plug from cylinder 1.
• Inspect the old spark plug for damage. Clean any debris from the spark plug hole.
• Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.043 inches for Toyota).
• Torque the spark plug to the manufacturer-recommended setting (usually around 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, ratchet.
• Unplug the electrical connector from the ignition coil.
• Remove the mounting bolts of the ignition coil using the socket set.
• Pull the ignition coil out of the spark plug hole.
• If the coil is faulty, install a new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector.

4. Fuel Injector Inspection

• Tools Required: Fuel injector cleaner, appropriate tools for removal if necessary.
• Check the fuel injector operation by using a noid light or multimeter to ensure it is receiving the correct electrical signal.
• If the injector is clogged or faulty, remove it and clean it using a fuel injector cleaning kit or replace it with a new one.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Use a smoke machine to introduce smoke into the intake manifold to identify any leaks.
• Alternatively, spray carburetor cleaner around the intake manifold and hoses while the engine is running; an increase in RPM indicates a vacuum leak.
• Repair or replace any leaking hoses or gaskets.