how to troubleshoot Toyota Tacoma N300 (2016-Present) with P0301 misfire code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary with OEM specifications (usually around 0.044 inches gap).
• Reinstall the spark plug and torque to manufacturer specifications (typically 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1.
• Test the ignition coil with a multimeter (check for primary and secondary resistance).
• If faulty, replace with a new ignition coil that meets OEM standards.
• Reinstall the ignition coil.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit, safety glasses.
• Disconnect the fuel injector connector and remove the fuel injector from cylinder 1.
• Clean the fuel injector using a proper cleaning solution per the kit instructions.
• If the injector is clogged beyond cleaning, replace it with an OEM injector.
• Reinstall the fuel injector and reconnect the electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove all spark plugs to allow for accurate testing.
• Insert the compression tester into cylinder 1.
• Crank the engine to take the reading; compare with manufacturer specifications (should be around 180 psi).
• If low, further investigation for internal engine issues is needed.