my Toyota Highlander Third Generation (2014-2019) has a knocking noise when I accelerate what is it

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

525 words

Problem Statement

Learn how to diagnose and fix knocking noise during acceleration in Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before performing inspections to avoid burns.

Symptoms

•Knocking noise during acceleration
•Possible vibrations felt through the cabin
•Loss of power during acceleration
•Engine misfire or rough running
•Increased fuel consumption

Diagnostic Steps

1
Inspect the engine and transmission mounts for wear or damage.
2
Scan for any Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
3
Check the condition of the spark plugs and ignition coils.
4
Inspect the exhaust system for loose components or leaks.
5
Examine the drive shaft and CV joints for wear or damage.
6
Test the fuel system pressure to ensure proper fuel delivery.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Multimeter
•Jack and jack stands

Parts Required

•Engine mounts
•Transmission mounts
•Spark plugs
•Ignition coils
•Exhaust components (if damaged)
•Drive shaft or CV joints (if needed)

Related Faults

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Diagnostic Steps

1
Inspect the engine and transmission mounts for wear or damage.
2
Scan for any Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
3
Check the condition of the spark plugs and ignition coils.
4
Inspect the exhaust system for loose components or leaks.
5
Examine the drive shaft and CV joints for wear or damage.
6
Test the fuel system pressure to ensure proper fuel delivery.

Solution

1. Preparation

Gather tools including a socket set, torque wrench, OBD-II scanner, and multimeter.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the battery negative terminal to ensure safety.

2. Inspect and Replace Engine/Transmission Mounts

Sub-steps:
1. Raise the vehicle using a jack and secure it on jack stands.
2. Locate the engine and transmission mounts.
3. Visually inspect mounts for cracks, tears, or separation.
4. If damaged, remove the bolts securing the mounts using a socket set.
5. Replace with new mounts and torque bolts to manufacturer's specifications (usually around 50-70 ft-lbs).

3. Check and Replace Spark Plugs/Ignition Coils

Sub-steps:
1. Remove the engine cover if applicable.
2. Disconnect the wiring harness from the ignition coils.
3. Remove the ignition coils and inspect for damage.
4. Check spark plugs for wear and carbon build-up; replace if necessary.
5. Reinstall new or cleaned components and ensure proper connection.

4. Inspect Exhaust System

Sub-steps:
1. Start the engine and visually inspect the exhaust system from the manifold to the tailpipe.
2. Look for loose bolts, broken hangers, or holes in the pipes.
3. Tighten any loose connections and replace damaged sections of the exhaust system.

5. Examine Drive Shaft and CV Joints

Sub-steps:
1. Inspect the drive shaft for any signs of damage or wear, including vibration or play.
2. Check CV joints for tearing or boot damage.
3. If damaged, remove the drive shaft or replace the CV joints as necessary.