why does my Honda Accord make a knocking noise when I accelerate

Honda Accord 10th Generation (2018-2022)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

573 words

Problem Statement

Learn how to diagnose and fix knocking noise during acceleration in Honda Accord. 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 the battery before working on electrical systems.
•Allow the engine to cool before opening any components.

Symptoms

•Knocking noise occurs during acceleration
•Potential loss of power or sluggish performance
•Engine misfire or rough running
•Vibration felt through the steering wheel or chassis
•Check engine light may illuminate (if misfire is detected)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any engine-related issues.
2
Inspect the engine mounts for wear or damage; a failing mount can cause knocking noises.
3
Check the condition of the spark plugs and ignition coils; a misfire can lead to knocking.
4
Inspect the drivetrain components, including CV joints and axles, for wear or damage.
5
Perform a visual inspection of the exhaust system for loose or damaged components.

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
•Spark plug gap tool
•Wrench set
•Jack and jack stands
•Torque wrench
•Flashlight

Parts Required

•Spark plugs
•Engine mounts (if found defective)
•CV joint or axle (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any engine-related issues.
2
Inspect the engine mounts for wear or damage; a failing mount can cause knocking noises.
3
Check the condition of the spark plugs and ignition coils; a misfire can lead to knocking.
4
Inspect the drivetrain components, including CV joints and axles, for wear or damage.
5
Perform a visual inspection of the exhaust system for loose or damaged components.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative terminal of the battery to ensure safety.
Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plugs

Tools Required: Socket set, spark plug gap tool.
Remove the ignition coils (if applicable) by unscrewing them.
Remove the spark plugs using a spark plug socket.
Inspect the old spark plugs for wear; replace them if they are worn or fouled.
Install new spark plugs, ensuring they are properly gapped according to specifications.
Reinstall the ignition coils and reconnect any electrical connectors.

3. Check Engine Mounts

Tools Required: Wrench set, jack and jack stands.
Lift the vehicle securely using a jack and place jack stands for safety.
Inspect the engine mounts for any signs of cracking or separation.
If damaged, remove the bolts securing the mount to the engine and frame.
Replace with new engine mounts, tightening bolts to the manufacturer’s specified torque.

4. Inspect Drivetrain Components

Tools Required: Torque wrench, flashlight.
Visually inspect CV joints and axles for any signs of wear or damage.
Check for excessive play in the CV joints; replace if necessary.
Tighten any loose bolts or components in the drivetrain.

5. Test Drive

Reconnect the battery terminal.
Start the engine and let it idle for a few minutes.
Carefully drive the vehicle to confirm that the knocking noise is eliminated.