how to fix Cadillac Escalade T1XX (2021-Present) engine knocking noise

Symptoms

• Engine knocking or pinging noise, especially under acceleration
• Loss of power during acceleration
• Rough idle or uneven engine running
• Increased oil consumption
• Check engine light illuminated

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2. Inspect engine oil level and condition to ensure it is at the correct level and not contaminated.
3. Perform a visual inspection of the engine components for any obvious signs of wear or damage, such as loose or damaged components.
4. Check for vacuum leaks using a smoke machine or similar tool to ensure there are no air intake issues.
5. Listen to the engine with a stethoscope to pinpoint the exact source of the knocking noise.
6. Perform a compression test on all cylinders to check for engine health and identify any potential internal issues.

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, stethoscope, compression tester, oil catch pan.
• Ensure the vehicle is parked on a level surface and the engine is cool before starting repairs.
• Disconnect the battery to prevent any electrical shorts.

2. Change Engine Oil and Filter

1. Drain the old engine oil:
   • Place an oil catch pan under the oil pan.
   • Remove the oil drain plug using a socket wrench and allow the oil to completely drain.
2. Replace the oil filter:
   • Use an oil filter wrench to remove the old oil filter.
   • Apply a thin layer of clean oil to the rubber seal of the new oil filter.
   • Install the new oil filter and tighten it to the manufacturer's specifications (typically hand tight plus a quarter turn).
3. Refill engine with new oil:
   • Replace the oil drain plug and tighten it to the specified torque (usually around 20-25 ft-lbs).
   • Add the recommended type and amount of oil (refer to the owner's manual).
   • Start the engine and let it run for a minute, then check for leaks.

3. Address Engine Components

1. Inspect and replace worn components:
   • Check the timing chain/belt for wear and replace if necessary.
   • Inspect the spark plugs; replace if worn or fouled.
   • Check the ignition coils and replace any that are malfunctioning.
2. Adjust valve clearance:
   • If the knocking noise persists, check and adjust the valve clearance according to manufacturer specifications.

4. Reassemble and Test

• Ensure all components are reassembled correctly.
• Reconnect the battery.
• Start the engine and listen for any knocking noise.
• If noise persists, further investigation may be required, potentially leading to more extensive repairs like engine disassembly.