my Toyota RAV4 XA50 (2019-2024) engine makes a rattling noise when cold

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, stethoscope, torque wrench, engine oil (recommended viscosity).
• Ensure the vehicle is parked on a level surface and the engine is off and cool before starting the inspection.

2. Engine Oil Change (if necessary)

• Sub-steps:
  1. Lift the Vehicle: Use a jack and jack stands to elevate the vehicle safely.
  2. Drain Old Oil: Remove the oil drain plug with a socket and allow the old oil to drain completely into a pan.
  3. Replace Oil Filter: Use an oil filter wrench to remove the old oil filter. Lubricate the O-ring of the new filter with new oil and install it.
  4. Replace Drain Plug: Reinstall the drain plug and torque it to the manufacturer’s specification (typically around 30 ft-lbs).
  5. Add New Oil: Pour in the recommended amount of new engine oil through the oil filler cap. Check the level with the dipstick and adjust as necessary.

3. Tightening Loose Components

• Sub-steps:
  1. Inspect Engine Mounts: Check all engine mounts for tightness using a wrench. Replace any mounts that appear worn.
  2. Secure Heat Shields: Tighten any loose bolts on heat shields and ensure they are securely fastened to prevent rattling.
  3. Check Other Components: Tighten any other identified loose components that may be contributing to the noise.

4. Inspecting Timing Components

• Sub-steps:
  1. Remove Access Covers: If necessary, remove the engine cover and any timing belt covers to access the timing components.
  2. Check Timing Chain/Belt Tension: Inspect the tensioner and guides for wear. Replace if they appear worn or loose.
  3. Reinstall Covers: Ensure all covers are secured properly once inspection is complete.