my Honda Accord 9th Generation (2013-2017) has a check engine light and running rough, what’s wrong?

Honda Accord Eleventh Generation (2023-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

599 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix engine rough running and check engine light issues in Honda Accord 2013-2017. Step-by-step guide with diagnostic procedures.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting or working on engine components.

Symptoms

•Check engine light illuminated
•Engine running roughly or unevenly
•Possible engine stalling
•Decreased fuel efficiency
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the ignition system, including spark plugs and ignition coils for wear or failure.
3
Check the air intake system for obstructions or leaks, including the air filter and intake hoses.
4
Inspect fuel delivery system components such as fuel pump and fuel injectors for proper operation.
5
Examine the vacuum hoses for cracks or disconnections that could lead to a vacuum leak.
6
Test the Mass Air Flow (MAF) sensor and ensure it is functioning correctly.

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
•Vacuum gauge
•Fuel pressure gauge

Parts Required

•Spark plugs (if worn)
•Ignition coils (if faulty)
•Air filter (if dirty)
•Fuel pump (if pressure is low)
•Fuel injectors (if faulty)
•Vacuum hoses (if damaged)
•MAF sensor (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the ignition system, including spark plugs and ignition coils for wear or failure.
3
Check the air intake system for obstructions or leaks, including the air filter and intake hoses.
4
Inspect fuel delivery system components such as fuel pump and fuel injectors for proper operation.
5
Examine the vacuum hoses for cracks or disconnections that could lead to a vacuum leak.
6
Test the Mass Air Flow (MAF) sensor and ensure it is functioning correctly.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, vacuum gauge.
Disconnect the negative battery terminal to ensure safety while working on the electrical systems.

2. Address Ignition System Issues

Remove Engine Cover (if applicable):
- Use a socket set to unbolt the engine cover.
Inspect Spark Plugs:
- Remove spark plugs using a spark plug socket.
- Check for wear, fouling, or damage; replace if necessary.
Check Ignition Coils:
- Remove ignition coils from the spark plugs.
- Test each coil with a multimeter for proper resistance; replace faulty coils.

3. Inspect Air Intake System

Remove Air Filter:
- Unclip the air filter housing and remove the air filter.
- Inspect for dirt and debris; replace if clogged.
Check Intake Hoses:
- Visually inspect hoses for cracks or loose connections.
- Replace any damaged hoses.

4. Examine Fuel Delivery System

Test Fuel Pressure:
- Connect a fuel pressure gauge to the fuel rail.
- Start the engine and check that the fuel pressure is within the manufacturer's specifications; replace the fuel pump if pressure is low.
Inspect Fuel Injectors:
- Remove fuel injector connectors.
- Test each injector for proper operation; replace any that are faulty.

5. Check for Vacuum Leaks

Inspect Vacuum Hoses:
- Visually check all vacuum hoses for cracks or disconnections.
- Replace any damaged hoses.
Perform a Smoke Test (if necessary):
- Use a smoke machine to identify hidden vacuum leaks in the intake manifold.

6. Test MAF Sensor

Remove MAF Sensor:
- Disconnect the electrical connector and unscrew the MAF sensor from the air intake.
Clean or Replace:
- Clean the sensor with MAF cleaner or replace it if faulty.