how to repair my Toyota Camry's P0300 misfire code?

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connectors and unbolt the ignition coils.
  3. Remove the spark plugs using a spark plug socket and ratchet.
  4. Inspect the spark plug gap and condition; replace with OEM specifications if worn.
  5. Reinstall the new spark plugs, torque to manufacturer specifications (typically 13-16 ft-lbs).

3. Test and Replace Ignition Coils (if necessary)

• Sub-steps:
  1. Use a multimeter to check the resistance of each ignition coil; compare readings with specifications.
  2. If any coil is out of specification, remove it and replace with a new one.
  3. Reconnect the ignition coil connectors.

4. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the intake manifold (if necessary) to access the fuel injectors.
  2. Use a fuel pressure gauge to check for proper fuel pressure (typically 30-40 psi).
  3. Clean or replace any faulty fuel injectors.
  4. Reassemble the intake manifold ensuring all gaskets are seated properly.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to identify any hidden leaks.
  3. Replace any damaged hoses and ensure all connections are secure.