why does my Toyota Corolla E140 (2006-2013) engine misfire when I accelerate?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if applicable.
2. Use a socket wrench to carefully remove the spark plugs.
3. Inspect each spark plug for wear and deposits; replace if necessary.
4. Set the gap on new spark plugs according to manufacturer specifications.
5. Install new spark plugs and torque them to the specified value (typically around 13-16 lb-ft).

3. Check and Replace Ignition Coils

1. Disconnect the electrical connectors from the ignition coils.
2. Use a socket wrench to remove the ignition coils from the engine.
3. Test each ignition coil with a multimeter to ensure proper resistance (consult service manual for specific values).
4. Replace any faulty ignition coils with new ones.
5. Reinstall coils and reconnect electrical connectors.

4. Verify Fuel System

1. Connect a fuel pressure gauge to the fuel rail.
2. Turn the ignition to the "ON" position (do not start) to check fuel pressure; it should be within the specified range.
3. If the pressure is low, check the fuel filter and pump for issues and replace if necessary.
4. Reconnect or replace any components as needed.

5. Inspect Air Intake and Vacuum System

1. Visually inspect the air intake for any obstructions or leaks.
2. Check the intake manifold and associated hoses for cracks or loose connections.
3. Replace any damaged hoses and ensure a tight fit on all connections.