how to fix a misfire in my Toyota Tacoma N300 (2016-Present) with P0301 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plug

• Remove the ignition coil cover if applicable.
• Use a socket wrench to remove the spark plug from cylinder 1.
  • Tools Required: Spark plug socket, ratchet, extension
• Inspect the old spark plug for fouling or wear; replace if necessary.
• Install a new spark plug, ensuring it is gapped correctly to the manufacturer specifications (typically around 0.044 inches for Toyota).
• Torque the spark plug to manufacturer specifications (approximately 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil in cylinder 1.
• Remove the ignition coil by unscrewing any retaining bolts.
• Inspect the ignition coil for signs of damage or wear.
• If faulty, replace with a new ignition coil specific to the vehicle model.
• Reattach the ignition coil and secure it with the retaining bolts. Connect the electrical connector.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Using a multimeter, check the resistance of the fuel injector to ensure it is within manufacturer specifications (typically between 12-16 ohms).
• If the injector is faulty, replace it with a new unit.
• Reconnect the fuel injector connector.

5. Reassemble and Reconnect Battery

• Reattach any components removed during the process.
• Reconnect the battery terminals, ensuring a tight fit.