why does my Toyota Highlander Third Generation (2014-2019) emit smoke from the exhaust?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool if it has been running.

2. Addressing Oil Consumption

1. Replace Valve Seals:

   • Remove the valve cover using a socket set.
   • Replace old valve seals with new ones, ensuring proper seating.
   • Reinstall the valve cover and torque to manufacturer specifications (typically around 7-10 Nm).

2. Replace Piston Rings (if necessary):

   • Remove the engine from the vehicle for easier access.
   • Disassemble the engine block to access the pistons.
   • Replace worn piston rings with new ones, ensuring proper orientation and installation.
   • Reassemble the engine and torque all components to manufacturer specifications.

3. Addressing Head Gasket Failure

1. Replace Head Gasket:
   • Remove the intake and exhaust manifolds.
   • Unbolt and remove the cylinder head.
   • Clean the surfaces thoroughly to remove old gasket material.
   • Install a new head gasket and reassemble the cylinder head with proper torque (typically around 25-30 Nm in a specific sequence).
   • Reinstall manifolds and reconnect all components.

4. Inspecting and Replacing PCV Valve

1. Inspect PCV Valve:

   • Locate the PCV valve in the engine compartment.
   • Remove the valve and check for clogs or damage.

2. Replace if necessary:

   • Install a new PCV valve, ensuring it fits securely.