how to fix rough idle issue in my Ford Mustang S550 (2015-2023)

Solution

1. Preparation

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

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Screwdrivers
• Clean rags
• Throttle body cleaner

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if applicable.
2. Using the socket set, carefully remove each spark plug, inspecting them for wear or carbon buildup.
3. Replace any damaged spark plugs with new ones, ensuring the gap is set to manufacturer's specifications (typically 0.030 inches for Ford).
4. Reinstall the spark plugs and torque them to the manufacturer's specification (usually around 13 lb-ft).

3. Clean the Throttle Body

1. Locate the throttle body and remove the intake ducting connected to it.
2. Use throttle body cleaner and a clean rag to gently clean the inside of the throttle body, removing any carbon deposits.
3. Reattach the intake ducting securely.

4. Inspect and Repair Vacuum Hoses

1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Replace any damaged hoses with new ones.
3. Ensure all hoses are securely connected and free of leaks.

5. Clean Fuel Injectors

1. If necessary, use a fuel injector cleaning kit or take the vehicle to a professional for ultrasonic cleaning.
2. Ensure that the fuel system is primed after cleaning.

6. Reconnect Battery and Test

1. Reconnect the negative battery terminal.
2. Start the engine and allow it to reach operating temperature.