how to fix the rough idle on my Ford Mustang S550 (2015-2023)

Solution

1. Preparation

• Gather all necessary tools and parts before starting.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if necessary.
• Disconnect the ignition coils and remove them using a socket.
• Remove the spark plugs using a spark plug socket.
• Inspect old spark plugs for wear or carbon buildup; replace with OEM spark plugs.
• Torque the new spark plugs to the manufacturer’s specifications (typically around 13-15 ft-lbs).
• Reinstall ignition coils and reconnect electrical connectors.

3. Clean or Replace Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set
• Remove the throttle body from the intake manifold by loosening the bolts.
• Clean the throttle plate and interior surfaces with throttle body cleaner and a cloth.
• Inspect the throttle position sensor (TPS) for proper function; replace if necessary.
• Reinstall the throttle body and reconnect any electrical connectors and hoses.

4. Check and Replace Fuel Filter

• Tools Required: Fuel line disconnect tool, socket set
• Locate the fuel filter and relieve fuel pressure by removing the fuel pump relay.
• Disconnect the fuel lines using the fuel line disconnect tool.
• Remove the old fuel filter and install the new one, ensuring the flow direction is correct.
• Reconnect the fuel lines and replace the fuel pump relay.

5. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Inspect all vacuum hoses for cracks or damage.
• Replace any compromised hoses and ensure tight connections.
• Use a vacuum gauge to verify that the engine has a proper vacuum reading.