how to fix rough idle in Cadillac Escalade T1XX (2021-Present)

Symptoms

• Check engine light illuminated
• Engine stalling at idle
• Rough or uneven engine vibrations
• Poor fuel economy
• Increased emissions
• Unusual engine noises at idle

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to identify any related fault codes.
2. Inspect the engine air filter for cleanliness and proper fit.
3. Check the throttle body for carbon buildup or obstructions.
4. Examine the fuel injectors for proper operation and any clogs.
5. Test the ignition system components, including spark plugs and ignition coils.
6. Check the vacuum lines and intake manifold for leaks.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting work.

2. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft brush
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner into the throttle body and scrub gently with a soft brush to remove carbon deposits.
• Wipe clean with a lint-free cloth and reassemble the intake duct.

3. Replace Spark Plugs

• Tools Required: Socket set, torque wrench
• Remove the engine cover to access the spark plugs.
• Disconnect the ignition coil connectors and remove the ignition coils.
• Use a spark plug socket to remove old spark plugs.
• Install new spark plugs, ensuring they are gapped correctly as per manufacturer specifications (usually around 0.040 inches).
• Torque the spark plugs to the manufacturer's specified value (usually around 15 lb-ft).
• Reinstall the ignition coils and cover.

4. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine (optional), hose clamps
• Inspect all vacuum hoses for cracks or disconnections.
• If available, use a smoke machine to test for vacuum leaks in the intake system.
• Replace damaged hoses or reconnect any loose connections.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, fuel line disconnect tool
• Disconnect the fuel lines from the injectors.
• Use a fuel injector cleaning kit to clean each injector according to the manufacturer's instructions.
• Reinstall the injectors and reconnect the fuel lines.