my Cadillac Escalade T1XX (2021-Present) engine light flashes when driving

Symptoms

• Check engine light flashing
• Rough engine idle
• Loss of power during acceleration
• Unusual engine noises (e.g., backfiring)
• Decreased fuel efficiency
• Possible emissions-related warnings

Diagnostic Steps

1. Scan the vehicle’s onboard diagnostics (OBD-II) system for trouble codes using an OBD-II scanner.
2. Inspect the spark plugs and ignition coils for wear or damage.
3. Check fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4. Examine the air intake system for obstructions or leaks.
5. Inspect the exhaust system for blockages or leaks.
6. Verify the condition of engine sensors (e.g., MAF, O2 sensors) using a multimeter.

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety.

2. Replace Spark Plugs and Ignition Coils

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connectors.
  3. Unscrew and remove the ignition coils using a socket wrench.
  4. Remove the old spark plugs with a spark plug socket.
  5. Install new spark plugs, hand-tighten, and then torque to manufacturer specifications (usually around 15-20 lb-ft).
  6. Reinstall the ignition coils and connectors.

3. Test Fuel System

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and attach the fuel pressure gauge.
  2. Turn the ignition on (do not start) to check the fuel pressure.
  3. Compare the reading to the manufacturer’s specifications (typically 55-62 psi).
  4. Replace the fuel filter if pressure is low and test again.

4. Inspect Air Intake and Exhaust Systems

• Tools Required: Basic hand tools, flashlight.
• Sub-steps:
  1. Visually inspect the air filter for dirt or blockages; replace if necessary.
  2. Check for any cracks or loose connections in the intake hoses.
  3. Inspect the exhaust pipe for any visible signs of blockage or damage.

5. Verify Engine Sensors

• Tools Required: Multimeter.
• Sub-steps:
  1. Check the MAF sensor for proper voltage and resistance according to specifications.
  2. Inspect O2 sensors for any signs of failure (e.g., sluggish response time).
  3. Replace any faulty sensors as necessary.