my Cadillac Escalade T1XX (2021-Present) runs rough at idle what can I do

Symptoms

• Check engine light illuminated
• Engine shakes or vibrates excessively at idle
• Decreased fuel economy
• Engine stalling intermittently
• Unusual noises from the engine compartment (e.g., knocking or pinging)

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to identify any diagnostic trouble codes (DTCs).
2. Inspect the air intake system for blockages or leaks, including the air filter.
3. Check the condition of the spark plugs and ignition coils for wear or damage.
4. Test fuel pressure using a fuel pressure gauge to ensure adequate fuel delivery.
5. Inspect vacuum lines for leaks or disconnections that could affect idle quality.
6. Examine the throttle body for carbon buildup or obstruction that may affect airflow.

Solution

1. Preparation

• Gather all necessary tools and parts. Ensure the vehicle is parked on a flat surface and is secure.
• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, torque wrench, cleaning supplies.

2. Addressing Error Codes

• If any DTCs were found, address them based on the specific code. Research the code meaning and recommended repairs.

3. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Disconnect the ignition coils and unscrew the spark plugs using a socket wrench.
• Inspect spark plugs for wear and replace them if necessary (use OEM specifications).
• Reinstall the ignition coils and engine cover.

4. Clean the Throttle Body

• Disconnect the battery to prevent electrical issues.
• Remove the air intake duct from the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle body thoroughly.
• Reconnect the air intake duct and the battery.

5. Check and Repair Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses and ensure all connections are tight.

6. Fuel System Check

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start) and check the fuel pressure reading.
• If the pressure is out of specification, replace the fuel pump or filter as needed.