why is my Toyota Highlander Third Generation (2014-2019) sputtering while driving

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Fuel System Inspection and Repair

1. Check Fuel Filter:

   • Locate the fuel filter (usually along the fuel line).
   • Remove and inspect for clogs. Replace if necessary.
   • Tools Required: Socket set, wrench.

2. Inspect Fuel Pump:

   • Access the fuel pump (may require removing the fuel tank or rear seat).
   • Check for proper operation and replace if malfunctioning.
   • Tools Required: Fuel pressure gauge, socket set, safety goggles.

3. Ignition System Maintenance

1. Replace Spark Plugs:

   • Remove the ignition coils to access the spark plugs.
   • Replace old spark plugs with new ones. Torque to manufacturer's specifications (typically around 13 lb-ft).
   • Tools Required: Socket set, torque wrench, dielectric grease.

2. Check Ignition Coils:

   • Inspect coils for cracks or wear.
   • Replace any faulty ignition coils.
   • Tools Required: Multimeter for testing, socket set.

4. Air Intake Inspection

1. Clean or Replace Air Filter:

   • Remove the air intake cover and inspect the air filter.
   • Clean if reusable or replace if it is dirty.
   • Tools Required: Screwdriver or socket set.

2. Inspect Air Intake Hoses:

   • Check for cracks or loose connections. Replace any damaged hoses.
   • Tools Required: Visual inspection tools.

5. Vacuum Leak Repair

• Inspect all vacuum hoses and connections around the engine for leaks.
• Replace any damaged hoses and ensure all connections are tight.
• Tools Required: Visual inspection tools.