how do I diagnose a misfire in my Toyota RAV4 XA40 (2013-2018)?

Solution

1. Preparation

• Gather tools and parts for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the negative battery terminal to prevent electrical shorts.
  3. Remove the ignition coils by unscrewing them and carefully lifting them out.
  4. Unscrew the old spark plugs using a spark plug socket and ratchet.
  5. Install new spark plugs by hand to avoid cross-threading, then torque to manufacturer specifications (typically 13-16 lb-ft).
  6. Reinstall ignition coils and reconnect the electrical connectors.

3. Test and Replace Ignition Coils (If Necessary)

• Sub-steps:
  1. Using a multimeter, check each ignition coil's primary and secondary resistance according to specifications.
  2. If any coil is faulty, disconnect it and replace it with a new one.
  3. Reconnect the ignition coil connector securely.

4. Clean or Replace Fuel Injectors

• Sub-steps:
  1. If injectors are clogged, use a fuel injector cleaner or remove them for cleaning.
  2. If replacing, disconnect the fuel lines and electrical connectors.
  3. Remove the old injectors using an injector puller tool.
  4. Install new fuel injectors, ensuring they are seated properly.
  5. Reconnect fuel lines and electrical connectors securely.