my Toyota Highlander makes a knocking noise when I accelerate what does that mean

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

542 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 working on the oil system.

Symptoms

•Knocking noise audible during acceleration
•Possible loss of power
•Engine misfires or rough running
•Decreased fuel efficiency
•Vibrations felt in the cabin

Diagnostic Steps

1
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
2
Scan for error codes using an OBD-II scanner to identify any underlying issues.
3
Check the ignition system components (spark plugs, wires, coils) for wear or damage.
4
Inspect the exhaust system for loose components or leaks that could amplify noise.
5
Examine the engine mounts for wear or damage, which may cause vibrations.
6
Check the condition of the fuel system, including fuel injectors and filters, for proper operation.

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
•Oil filter wrench
•Torque wrench
•Oil pan
•Funnel

Parts Required

•Engine oil (5W-30 or as specified)
•Oil filter
•Spark plugs (as needed)
•Engine mounts (if damaged)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
2
Scan for error codes using an OBD-II scanner to identify any underlying issues.
3
Check the ignition system components (spark plugs, wires, coils) for wear or damage.
4
Inspect the exhaust system for loose components or leaks that could amplify noise.
5
Examine the engine mounts for wear or damage, which may cause vibrations.
6
Check the condition of the fuel system, including fuel injectors and filters, for proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.
Raise the vehicle and secure it on jack stands if necessary.

2. Check and Change Engine Oil

Sub-steps:
- Remove the oil dipstick and check the oil level.
- If low, add the appropriate oil type (5W-30 or as specified in the owner’s manual).
- If dirty, drain the old oil using an oil pan and replace it with new oil.
- Replace the oil filter using an oil filter wrench.
Tools Required: Oil filter wrench, socket set, oil pan, funnel.
Safety Warnings: Allow engine to cool before working on the oil system.

3. Inspect and Replace Ignition Components

Sub-steps:
- Remove the ignition coil and inspect the spark plug condition.
- Replace any worn or damaged spark plugs with new ones (OEM recommended).
- Reinstall ignition coils securely.
Tools Required: Socket set, spark plug socket.

4. Examine Engine and Exhaust Mounts

Sub-steps:
- Visually inspect engine mounts for cracks or separation.
- Replace any damaged mounts with new OEM mounts.
- Check the exhaust system for loose bolts or damaged hangers, tightening or replacing as necessary.
Tools Required: Socket set, torque wrench.

5. Test Drive and Check Fuel System

Sub-steps:
- Ensure all components are reassembled properly.
- Reconnect the negative battery terminal.
- Start the engine and check for noises; perform a test drive to check for performance.
Tools Required: None specified for this step.