how to replace the spark plugs in my Honda Accord 10th Generation (2018-2022)

Honda Accord 8th Generation (2008-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

551 words

Problem Statement

Step-by-step guide on how to replace spark plugs in Honda Accord 10th Generation (2018-2022). Includes symptoms, diagnostic steps, and tools required.

Affected Component

Engine

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the engine is cool before starting work.
•Disconnect the battery to prevent electrical shorts during the process.

Symptoms

•Engine misfires or rough idling
•Decreased fuel economy
•Difficulty starting the engine
•Check engine light illuminated
•Increased exhaust emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any misfire-related codes.
2
Inspect the current spark plugs for wear, carbon buildup, or damage.
3
Check ignition coil operation to ensure they are functioning properly.
4
Assess overall engine performance and fuel trim readings.

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

•Socket set (10mm and 12mm sockets)
•Torque wrench
•Spark plug socket (typically 5/8 inch)
•Extension bar
•Ratchet
•Vacuum cleaner or compressed air
•Anti-seize compound (optional)

Parts Required

•4 new spark plugs (ensure they match OEM specifications)

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Solution

1. Preparation

Gather tools and parts required for the replacement.
Ensure the engine is cool to avoid burns.
Disconnect the negative battery terminal to prevent electrical shorts.

Tools Required:

Socket set (10mm and 12mm sockets)
Torque wrench
Spark plug socket (typically 5/8 inch)
Extension bar
Ratchet
Vacuum cleaner or compressed air
Anti-seize compound (optional)

2. Remove Engine Cover (if applicable)

Use a socket wrench to remove any screws or bolts securing the engine cover.
Carefully lift off the cover and set it aside.

3. Access Spark Plugs

Identify the location of the spark plugs; usually found near the top of the engine under the ignition coils.
Disconnect the electrical connectors from the ignition coils by pressing the tab and pulling them off gently.
Remove the bolts holding the ignition coils in place using the appropriate socket.

4. Remove Old Spark Plugs

Using a spark plug socket and ratchet, carefully unscrew the old spark plugs. Turn counterclockwise to remove.
Inspect the spark plugs for wear and compare to new plugs.

5. Install New Spark Plugs

Apply a small amount of anti-seize compound to the threads of the new spark plugs (optional).
Carefully thread the new spark plugs into the cylinder head by hand to avoid cross-threading.
Tighten using a torque wrench to the manufacturer’s specification (typically around 13-15 lb-ft).

6. Reinstall Ignition Coils

Reinstall the ignition coils over the new spark plugs and secure them with the previously removed bolts.
Reconnect the electrical connectors to each ignition coil.

7. Reattach Engine Cover (if applicable)

Place the engine cover back onto the engine and secure it with the screws or bolts.

8. Reconnect Battery

Reconnect the negative battery terminal.