why does my Toyota Corolla E170 (2013-2019) engine stutter when accelerating

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coil cover using a socket set.
  2. Disconnect the ignition coils from the spark plugs.
  3. Remove the old spark plugs using a spark plug socket.
  4. Check the gap on the new spark plugs and install them according to manufacturer specifications.
  5. Reconnect the ignition coils and cover.

3. Clean or Replace the Throttle Body

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Use throttle body cleaner and a soft brush to clean the interior surfaces.
  3. Inspect the throttle plate for proper operation and free movement.
  4. Reassemble all components securely.

4. Check and Repair Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail and turn on the ignition (do not start the engine).
  2. Verify that the fuel pressure is within the manufacturer's specifications.
  3. If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or leaks.
  4. Replace the fuel filter if it appears clogged.

5. Inspect MAF Sensor and Clean

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector.
  3. Use MAF cleaner to gently clean the sensor elements.
  4. Reconnect the MAF sensor and ensure all connections are secure.