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Home/Cars/Toyota/Highlander/Third Generation (2014-2019)/how to replace the spark plugs in my Toyota Highlander Third Generation (2014-2019)

how to replace the spark plugs in my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Severity: mediumDifficulty: medium1-2 hours
3 min read
535 words

Problem Statement

Step-by-step guide to replacing spark plugs in a 2014-2019 Toyota Highlander. Learn symptoms, diagnostic steps, and tools required for the repair.

Component
Engine
Repair Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components
  • ⚠Allow the engine to cool before starting the repair

Symptoms

  • •Engine misfires or runs unevenly
  • •Poor acceleration and loss of power
  • •Decreased fuel economy
  • •Engine light illuminated
  • •Rough idle or vibrations at idle

Diagnostic Steps

  1. 1Inspect spark plug condition visually (look for wear or deposits)
  2. 2Check for error codes using an OBD-II scanner
  3. 3Measure spark plug gap with a feeler gauge to ensure it is within specifications
  4. 4Test ignition coil operation using a multimeter
  5. 5Check for any vacuum leaks that may affect engine performance

Solution

Solution

1. Preparation

  • Gather all necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical shock or short circuits.

2. Remove Engine Cover (if applicable)

  • Use a socket set to remove any bolts securing the engine cover.
  • Gently lift off the engine cover and set it aside.

3. Access Spark Plugs

  • Locate the ignition coils on top of the spark plugs.
  • Disconnect the electrical connectors from each ignition coil by pressing the tab and pulling it out.
  • Remove the bolts securing each ignition coil using a socket wrench.
  • Gently pull each ignition coil out of the spark plug well.

4. Remove Old Spark Plugs

  • Use a spark plug socket and ratchet to carefully unscrew and remove the old spark plugs from the cylinder head.
  • Inspect the removed spark plugs for signs of wear or damage.

5. Install New Spark Plugs

  • Check and adjust the gap on the new spark plugs using a feeler gauge (refer to manufacturer's specifications, typically around 0.043 inches).
  • Apply a small amount of anti-seize compound to the threads of the new spark plugs (optional).
  • Hand-tighten the new spark plugs into the cylinder head, then use a torque wrench to tighten them to the specified torque (typically around 13 lb-ft).

6. Reinstall Ignition Coils

  • Carefully insert each ignition coil back into its respective spark plug well.
  • Secure the ignition coils with their bolts and reconnect the electrical connectors.

7. Replace Engine Cover

  • Reinstall the engine cover, if removed, and secure it with the appropriate bolts.

8. Reconnect Battery

  • Reconnect the negative battery terminal and ensure it is secure.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • Socket set
  • Spark plug socket
  • Torque wrench
  • Ratchet
  • Feeler gauge
  • Multimeter

Parts Required

  • New spark plugs (compatible with 2014-2019 Toyota Highlander)
  • Optional: Anti-seize compound

Additional Information

Component

Engine

Repair Time

1-2 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

2 items

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