why does my Toyota Camry Eighth Generation (2018-present) have a rough idle at start-up

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, cleaning supplies.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery cable for safety.

2. Check and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing the bolts.
  2. Disconnect the ignition coil connectors.
  3. Remove the ignition coils using a socket set.
  4. Unscrew the spark plugs using a spark plug socket and inspect for wear.
  5. Replace with new spark plugs, ensuring proper torque (typically 13-15 ft-lbs).
  6. Reinstall ignition coils and connectors, and reattach the engine cover.

3. Clean Throttle Body

• Sub-steps:
  1. Locate the throttle body and disconnect any electrical connectors.
  2. Remove the intake duct leading to the throttle body.
  3. Use throttle body cleaner and a soft cloth to clean the interior surfaces.
  4. Reassemble the intake duct and reconnect electrical connectors.

4. Inspect and Replace Fuel Filter (if applicable)

• Sub-steps:
  1. Locate the fuel filter (if external) and relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Disconnect the fuel lines from the filter using appropriate tools.
  3. Replace with a new fuel filter and reconnect the lines, ensuring no leaks.