why is my Toyota Corolla E140 (2006-2013) fuel economy suddenly worse?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to ensure safety during repairs.

2. Replace Air Filter

• Locate the air filter housing and open it.
• Remove the old air filter and inspect for dirt and blockages.
• Install a new air filter, ensuring it fits snugly into the housing.
• Reassemble the air filter housing and reconnect any clips or screws.

3. Clean or Replace Fuel Injectors

• If cleaning:
  • Remove the fuel rail following manufacturer instructions.
  • Use a fuel injector cleaner and a suitable adapter to clean each injector.
  • Reinstall the injectors and fuel rail, ensuring all seals are intact.
• If replacing:
  • Remove the old injectors and install new ones, ensuring correct orientation and fit.
  • Reconnect fuel lines and any electrical connectors.

4. Replace Spark Plugs

• Remove the ignition coil packs (if applicable) to access the spark plugs.
• Use a spark plug socket to remove the old spark plugs.
• Check the gap on new spark plugs and adjust if necessary before installation.
• Install new spark plugs and reattach the ignition coil packs.

5. Check and Adjust Tire Pressure

• Use a tire pressure gauge to measure the pressure of each tire.
• Inflate tires to the recommended pressure as stated on the driver's door jamb.
• Inspect tires for signs of wear and alignment issues.