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my Honda Accord has a rough idle when in gear what should I do - Honda Accord
Home/Cars/Honda/Accord/8th Generation (2008-2012)/my Honda Accord has a rough idle when in gear what should I do

my Honda Accord has a rough idle when in gear what should I do

Honda Accord 8th Generation (2008-2012)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
609 words

Problem Statement

Learn how to diagnose and fix rough idle issues 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 battery before working on electrical components.
  • •Allow engine to cool before opening the intake system.

Symptoms

  • •Check engine light illuminated
  • •Engine stalling or hesitation
  • •Increased vibrations felt in the cabin
  • •Poor acceleration response
  • •Reduced fuel economy
  • •Unusual engine noise (e.g., knocking or pinging)

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Spark plug socket
  • •Fuel pressure gauge
  • •Smoke machine
  • •Carburetor cleaner
  • •Cleaning solvent (like throttle body cleaner)

Parts Required

  • •Spark plugs
  • •Ignition coils (if necessary)
  • •Air filter
  • •Vacuum hoses (if needed)
  • •Idle air control valve (if necessary)

Additional Information

Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
8 items
Parts Required
5 items

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Solution
1. Preparation
  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to prevent electrical short circuits.
  • Allow the engine to cool down before performing any work.
2. Replace Spark Plugs and Ignition Coils
  • Tools Required: Socket set, torque wrench, spark plug socket.
  • Remove the ignition coil cover (if applicable) by unscrewing bolts.
  • Disconnect the electrical connectors from the ignition coils.
  • Remove the ignition coils by unscrewing them from the engine.
  • Remove the old spark plugs using the spark plug socket.
  • Install new spark plugs, ensuring they are gapped correctly (usually 0.043 inches for most Honda models).
  • Reinstall the ignition coils and reconnect the electrical connectors.
  • Torque the ignition coils to the manufacturer's specifications (typically around 15-20 ft-lbs).
3. Inspect and Replace Air Filter
  • Tools Required: None
  • Remove the air filter housing cover by unscrewing or unclipping it.
  • Take out the old air filter and inspect it for dirt and wear.
  • Install a new air filter, ensuring it fits snugly in the housing.
  • Reattach the air filter housing cover.
4. Check and Repair Vacuum Leaks
  • Tools Required: Smoke machine or carburetor cleaner.
  • Inspect all vacuum hoses connected to the intake manifold for cracks or loose fittings.
  • Use a smoke machine to detect leaks, or spray carburetor cleaner around the hoses while the engine is running to identify any changes in idle.
  • Replace any damaged hoses or fittings.
5. Clean or Replace Idle Air Control Valve (IAC)
  • Tools Required: Socket set, cleaning solvent (like throttle body cleaner).
  • Locate the IAC valve on the throttle body.
  • Disconnect the electrical connector and remove the mounting screws.
  • Clean the valve with throttle body cleaner; if it is damaged, replace it with a new one.
  • Reinstall the IAC valve and reconnect the electrical connector.