my Toyota Camry has a rough idle when I first start it in the morning, what's wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Clean the Throttle Body

• Remove the air intake duct connected to the throttle body using a socket set.
• Spray throttle body cleaner into the throttle body while opening the throttle plate manually.
• Wipe clean with a lint-free cloth to remove carbon deposits.
• Reinstall the air intake duct and reconnect the negative battery terminal.

3. Inspect and Replace Spark Plugs

• Remove any engine covers obstructing access to spark plugs.
• Using a socket wrench, carefully remove each spark plug and inspect for wear or damage.
• Replace worn or fouled spark plugs with new ones, ensuring to use the manufacturer-recommended type and gap.
• Reinstall the engine covers securely.

4. Test and Clean the IAC Valve

• Locate the IAC valve, usually found on or near the throttle body.
• Disconnect the electrical connector and remove the IAC valve using a socket set.
• Clean the valve with throttle body cleaner and a brush if necessary.
• Reinstall the IAC valve and reconnect the electrical connector.

5. Check Fuel System Pressure

• Use a fuel pressure gauge to connect to the fuel rail test port.
• Turn the ignition to the ON position (do not start the engine) and check pressure.
• Compare the reading with manufacturer specifications; if low, inspect the fuel pump and filter for issues.