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Home/Cars/Toyota/Highlander/Third Generation (2014-2019)/why does my Toyota Highlander shudder when accelerating

why does my Toyota Highlander shudder when accelerating

Toyota Highlander Third Generation (2014-2019)

Severity: mediumDifficulty: medium3-5 hours
3 min read
523 words

Problem Statement

Learn how to diagnose and fix shuddering during acceleration in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Component
Engine
Repair Time
3-5 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems
  • ⚠Allow engine and transmission to cool before performing maintenance

Symptoms

  • •Shuddering or vibrating sensation during acceleration
  • •Loss of power or sluggish acceleration
  • •Unusual noises from the engine or transmission
  • •Check engine light illuminated
  • •Poor fuel economy

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify any stored diagnostic trouble codes (DTCs)
  2. 2Inspect the engine mounts for wear or damage
  3. 3Check the condition of the transmission fluid
  4. 4Examine the drive shafts and CV joints for any signs of damage or wear
  5. 5Test the spark plugs and ignition coils for proper functionality and wear
  6. 6Inspect the fuel system, including the fuel filter and fuel pump, for blockages or failures

Solution

Solution

1. Preparation

  • Gather tools and parts needed for the repair.
  • Disconnect the battery to prevent electrical shorts during work.
  • Allow the vehicle to cool if the engine has been running.

2. Inspect and Replace Engine Mounts

  • Sub-steps:
    1. Locate the engine mounts (typically found on both sides of the engine and at the rear).
    2. Use a socket set to remove bolts securing the engine mounts to the engine and frame.
    3. Remove the damaged engine mounts and replace them with new ones, ensuring they are aligned properly.
    4. Torque the bolts to the manufacturer’s specifications (consult repair manual for specific torque values).

3. Check and Change Transmission Fluid

  • Sub-steps:
    1. Locate the transmission dipstick or drain plug (depending on design).
    2. If using a drain plug, drain the old fluid into a suitable container.
    3. Replace with the manufacturer-recommended transmission fluid, filling to the appropriate level using a funnel.
    4. Start the vehicle and let it run for a few minutes, then check the fluid level again.

4. Replace Spark Plugs and Ignition Coils

  • Sub-steps:
    1. Remove the ignition coils by unscrewing the bolts and unplugging the electrical connector.
    2. Take out the old spark plugs using a spark plug socket and ratchet.
    3. Install new spark plugs, ensuring they are gapped correctly to manufacturer specifications.
    4. Reinstall the ignition coils and secure them with bolts.

5. Inspect and Replace Fuel Filters (if necessary)

  • Sub-steps:
    1. Locate the fuel filter; it could be in-line or part of the fuel pump assembly.
    2. Disconnect the fuel lines carefully, using a rag to catch any spills.
    3. Replace the old fuel filter with a new one, ensuring all connections are secure.
    4. Reconnect the battery and start the engine, checking for leaks.

Tools Required:

  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Spark plug socket
  • Screwdrivers
  • Funnel

Parts Required:

  • Engine mounts
  • Transmission fluid
  • Spark plugs
  • Ignition coils (if necessary)
  • Fuel filter (if necessary)

Estimated Repair Time: 3-5 hours

Safety Warnings:

  • Disconnect the battery before working on electrical systems.
  • Allow engine and transmission to cool before performing maintenance.

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

  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Spark plug socket
  • Screwdrivers
  • Funnel

Parts Required

  • Engine mounts
  • Transmission fluid
  • Spark plugs
  • Ignition coils
  • Fuel filter

Additional Information

Component

Engine

Repair Time

3-5 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

5 items

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