how to fix my Toyota Camry Eighth Generation (2018-present) with P0300 misfire code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool before working on it.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, multimeter.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connectors.
• Remove the ignition coils using a socket wrench.
• Inspect the spark plugs and replace them if worn or damaged.
  • Torque new spark plugs to the manufacturer's specification (typically around 13-15 lb-ft).
• Reinstall the ignition coils, ensuring they click into place securely.
• Reconnect the ignition coil connectors.

3. Fuel System Check

• Tools Required: Fuel pressure gauge.
• Check the fuel pressure at the fuel rail using the gauge.
  • Refer to the manufacturer specifications for correct pressure (usually around 50-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter for issues.
• Check injectors for clogs or leaks; clean or replace as necessary.

4. Vacuum Leak Repair

• Inspect all vacuum lines for cracks or disconnections.
• Use a smoke test or spray soapy water on suspected areas to identify leaks.
• Replace any damaged vacuum hoses or seals.

5. Compression Test

• Tools Required: Compression tester.
• Remove spark plugs and insert the compression tester into each cylinder.
• Crank the engine and record the compression readings.
  • Ensure all cylinders are within manufacturer specifications (usually around 180-220 psi).
• If any cylinder readings are low, further inspection of valves and piston rings may be necessary.