my Toyota Corolla E140 (2006-2013) has poor fuel economy what could be causing it

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Air Filter

• Remove the air filter housing cover using a socket set.
• Take out the old air filter and inspect the housing for debris.
• Install a new air filter, ensuring it is seated properly, and reattach the housing cover.
• Tools Required: Socket set, new air filter.

3. Clean or Replace Fuel Injectors

• Remove the fuel injector harness and fuel rail assembly using the appropriate sockets.
• If cleaning, use a fuel injector cleaning kit and follow the manufacturer's instructions; if replacing, install new injectors.
• Reinstall the fuel rail with the correct torque values (typically around 15-20 ft-lbs).
• Tools Required: Socket set, fuel injector cleaning kit or new fuel injectors.

4. Replace Spark Plugs

• Remove the ignition coils or spark plug wires to access the spark plugs.
• Use a spark plug socket to remove old spark plugs.
• Inspect and gap new spark plugs according to manufacturer specifications before installing.
• Reinstall ignition coils or spark plug wires.
• Tools Required: Spark plug socket, torque wrench.

5. Check Tire Pressure

• Use a tire pressure gauge to measure the pressure in all tires.
• Inflate tires to the manufacturer's recommended pressure found on the door jamb sticker.
• Inspect tire tread for uneven wear; replace if necessary.
• Tools Required: Tire pressure gauge, air compressor.