my Honda Accord has a rough idle when cold starting what's the issue

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Addressing the Coolant Temperature Sensor

• Locate the coolant temperature sensor (CTS) on the engine.
• Disconnect the electrical connector from the CTS.
• Remove the CTS using a socket wrench.
• Install the new CTS and reconnect the electrical connector.
• Torque the sensor to the manufacturer’s specification (typically around 15-20 Nm).

3. Inspecting and Cleaning the Throttle Body

• Remove the air intake duct to access the throttle body.
• Use a throttle body cleaner and a soft cloth to clean the interior surfaces and the throttle plate.
• Check for proper operation of the throttle plate.
• Reinstall the intake duct and ensure all clamps are secure.

4. Replacing Spark Plugs

• Remove the ignition coil covers if applicable.
• Disconnect the ignition coils and remove them from the spark plugs.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the gap on the new spark plugs and adjust to manufacturer specifications (typically around 0.043 inches).
• Install the new spark plugs, torqueing them to the manufacturer’s specification (usually around 13-15 Nm).
• Reinstall the ignition coils.

5. Testing Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) to measure the pressure.
• Compare the reading to manufacturer specifications (typically around 40-50 psi).
• If low pressure is detected, inspect the fuel pump and filter for issues.