my Toyota Highlander makes a knocking noise when accelerating what's wrong

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

513 words

Problem Statement

Diagnose and fix knocking noise during acceleration in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before performing inspections or repairs.

Symptoms

•Knocking noise when accelerating
•Possible loss of power during acceleration
•Unusual vibrations felt in the cabin
•Check engine light illuminated
•Engine misfire

Diagnostic Steps

1
Inspect the engine oil level and condition to rule out low oil or dirty oil.
2
Scan for error codes using an OBD-II scanner to check for any logged diagnostic trouble codes (DTCs).
3
Visually inspect the engine mounts for wear or damage.
4
Check the spark plugs for wear, fouling, or improper gap.
5
Inspect the exhaust system for any loose components or leaks.
6
Test the drive shafts and CV joints for wear or damage.

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

•Jack and jack stands
•Socket set
•OBD-II scanner
•Torque wrench
•Multimeter
•Basic hand tools

Parts Required

•Engine mounts
•Spark plugs
•CV joints or drive shafts

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Diagnostic Steps

1
Inspect the engine oil level and condition to rule out low oil or dirty oil.
2
Scan for error codes using an OBD-II scanner to check for any logged diagnostic trouble codes (DTCs).
3
Visually inspect the engine mounts for wear or damage.
4
Check the spark plugs for wear, fouling, or improper gap.
5
Inspect the exhaust system for any loose components or leaks.
6
Test the drive shafts and CV joints for wear or damage.

Solution

1. Preparation

Tools Required: Jack and jack stands, socket set, OBD-II scanner, torque wrench, multimeter, and basic hand tools.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery for safety.

2. Check Engine Oil

Remove the dipstick and wipe it clean.
Reinsert the dipstick and remove it again to check the oil level.
If the oil is low, add the manufacturer-recommended oil type until the proper level is reached.

3. Inspect Engine Mounts

Lift the vehicle using a jack and secure it with jack stands.
Visually inspect the engine mounts for cracks or separation.
If damaged, replace the engine mounts with OEM parts.

4. Examine Spark Plugs

Remove the spark plug wires carefully.
Use a socket wrench to remove the spark plugs.
Inspect each plug for signs of wear, fouling, or incorrect gap. Replace if necessary with OEM spark plugs.

5. Inspect Exhaust System

Check all exhaust hangers and connections for looseness or damage.
Tighten or replace any loose components to eliminate noise.

6. Test Drive Shafts and CV Joints

Inspect the CV boots for tears or leaking grease.
Check for play in the CV joints by rotating the wheels and feeling for any irregular movement.
Replace any damaged drive shafts or CV joints as needed.