my Honda Civic 9th Generation (2012-2015) engine is stalling at stops, what's wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Clean Throttle Body

• Tools Required: Throttle body cleaner, soft brush, and rag.
• Remove the air intake duct connected to the throttle body.
• Spray throttle body cleaner inside the throttle body and use a soft brush to clean it.
• Wipe clean with a rag to ensure all residue is removed.
• Reattach the air intake duct securely.

3. Inspect Fuel System

• Tools Required: Fuel pressure gauge and basic hand tools.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition key to the "ON" position without starting the engine to check fuel pressure.
• If pressure is low, inspect the fuel pump and fuel filter for issues and replace if necessary.

4. Check and Replace Ignition Components

• Tools Required: Socket set and torque wrench.
• Remove the ignition coils and inspect for cracks or damage.
• Check spark plugs for wear and replace if necessary, ensuring to use the correct gap specification.
• Reinstall ignition coils and ensure they are properly seated.

5. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine (if available).
• Visually inspect all vacuum lines and the intake manifold for signs of wear or damage.
• Use a smoke machine to detect any hidden vacuum leaks.
• Replace any damaged hoses or seals as needed.