why does my Toyota Camry XV40 (2007-2011) make a knocking noise when starting?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety during the repair process.
• Allow the engine to cool if it has been running.

2. Check and Change Engine Oil

• Sub-steps:
  1. Locate the oil dipstick and pull it out to check the oil level.
  2. If oil is low, add the manufacturer-recommended oil type.
  3. If oil is dirty or has not been changed per schedule, drain the old oil using a socket set and oil catch pan.
  4. Replace the oil filter with a new one.
  5. Refill with fresh engine oil as specified in the owner's manual.
• Tools Required: Socket set, oil catch pan, oil filter wrench, funnel.

3. Inspect and Replace Starter Motor (if necessary)

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the wiring harness from the starter motor.
  3. Remove the starter motor bolts with a socket set and take out the starter.
  4. Install the new starter motor by reversing the removal process.
  5. Reconnect the battery and test to ensure proper operation.
• Tools Required: Socket set, wrench set, multimeter (for testing).

4. Check Engine Mounts

• Sub-steps:
  1. Visually inspect engine mounts for cracks or excessive wear.
  2. Use a jack to support the engine gently and remove the mounting bolts.
  3. Replace any damaged mounts with new ones.
  4. Reinstall and tighten bolts to the manufacturer-specified torque.
• Tools Required: Socket set, jack, torque wrench.

5. Inspect Timing Belt/Chain

• Sub-steps:
  1. Remove any components obstructing access to the timing cover.
  2. Check the tension of the timing belt/chain and inspect for wear.
  3. If necessary, replace the timing belt/chain according to the service manual.
  4. Ensure all timing marks align properly when reinstalling.
• Tools Required: Socket set, timing tool, torque wrench.