my Toyota Corolla E170 (2013-2019) engine is idling rough what's wrong

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Remove the ignition coil covers using a socket set.
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils using a ratchet and socket.
• Remove the spark plugs with a spark plug socket and inspect for wear or deposits.
• Replace with new spark plugs, ensuring they are gapped correctly (typically 0.043 inches for Toyota).
• Reinstall the ignition coils and reconnect the electrical connectors.

3. Clean the Throttle Body

• Locate the throttle body and remove the air intake duct.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
• Reassemble the intake duct securely.

4. Check and Replace Air Filter

• Open the air filter housing by releasing clips or screws.
• Remove the old air filter and inspect it for dirt and clogging.
• Install a new, clean air filter, ensuring it fits snugly in place.

5. Inspect for Vacuum Leaks

• Visually inspect vacuum lines for cracks or disconnections.
• Use a smoke tester or carburetor cleaner to check for leaks by spraying around joints and connections.

Tools Required:

• OBD-II scanner
• Socket set
• Ratchet and spark plug socket
• Throttle body cleaner
• Fuel pressure gauge
• Screwdrivers

Parts Required:

• Spark plugs
• Air filter
• Ignition coils (if faulty)
• Vacuum hoses (if damaged)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before opening the air intake or throttle body.