why does my Toyota Camry's engine make a loud knocking noise

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues during repair.

2. Change Engine Oil and Filter

• Sub-steps:
  1. Drain the old engine oil using a socket set to remove the oil drain plug.
  2. Replace the oil filter using an oil filter wrench.
  3. Reinstall the drain plug and torque to the manufacturer's specifications (usually around 20-25 ft-lbs).
  4. Fill the engine with new oil of the recommended type (usually 5W-30 for most models).

3. Inspect and Replace Worn Components

• Sub-steps:
  1. Remove the valve cover and inspect the rocker arms and lifters for wear.
  2. Replace any damaged components such as lifters or rocker arms.
  3. If knocking is coming from the bottom end, inspect the crankshaft and connecting rods for wear.
  4. Replace any worn bearings or components as necessary.

4. Recheck Timing Components

• Sub-steps:
  1. Remove the timing cover to inspect the timing belt/chain for wear.
  2. Replace the timing belt/chain and tensioner if any wear or misalignment is detected.

5. Reassemble and Final Checks

• Sub-steps:
  1. Reinstall any components removed during inspection.
  2. Reconnect the battery.
  3. Start the engine and listen for any remaining noise.