how to fix a misfire issue on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the engine is cool before starting work.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Replace Spark Plugs

• Step 1: Remove the engine cover if applicable.
• Step 2: Use a spark plug socket to unscrew the old spark plugs.
• Step 3: Inspect the old spark plugs for signs of wear or damage.
• Step 4: Apply a small amount of anti-seize compound to the threads of the new spark plugs.
• Step 5: Install the new spark plugs by hand, then torque them to the manufacturer's specification (usually around 13-16 ft-lbs).
• Step 6: Reattach the engine cover.

3. Inspect and Replace Ignition Coils

• Step 1: Remove the ignition coil connectors by pressing the locking tab and pulling the connector off.
• Step 2: Unscrew the ignition coil bolts and remove the ignition coils.
• Step 3: Test each coil with a multimeter for proper resistance (consult service manual for specifications).
• Step 4: Replace any faulty ignition coils with new ones, securing them with bolts to the recommended torque.
• Step 5: Reconnect the ignition coil connectors.

4. Clean or Replace Fuel Injectors

• Step 1: Remove the fuel rail by unscrewing the bolts securing it.
• Step 2: Disconnect the fuel lines carefully, using a rag to catch any spilled fuel.
• Step 3: Remove the fuel injectors from the rail; inspect for clogs or damage.
• Step 4: Clean injectors using an ultrasonic cleaner or replace them with new ones if necessary.
• Step 5: Reassemble the fuel rail and reconnect lines, ensuring no leaks.

5. Check for Vacuum Leaks

• Step 1: Inspect all vacuum lines for cracks or disconnections.
• Step 2: If needed, use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
• Step 3: Replace any damaged vacuum lines to ensure proper air-fuel mixture.