GMC Sierra T1XX (2019-Present) engine makes a knocking noise when accelerating, what's the cause?

Learn how to diagnose and fix engine knocking noise in GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect Engine Oil

• Sub-steps:
  1. Remove the oil dipstick and wipe it clean.
  2. Insert the dipstick back into the tube and pull it out to check the oil level.
  3. If oil is low, top off with the manufacturer-recommended oil type (e.g., SAE 0W-20).
  4. If oil appears contaminated, consider an oil change.
• Tools Required: Oil dipstick, funnel.

3. Check Engine Components

• Sub-steps:
  1. Remove engine covers if applicable for better access.
  2. Visually inspect the spark plugs for wear or damage; replace if necessary.
  3. Inspect the timing chain or belt for wear; replace if there is significant slack or damage.
  4. Tighten any loose bolts or components found during inspection.
• Tools Required: Socket set, torque wrench.

4. Compression Test

• Sub-steps:
  1. Remove spark plugs for access to the cylinder.
  2. Insert a compression gauge into the spark plug hole of each cylinder.
  3. Crank the engine and record the compression readings.
  4. Compare readings to manufacturer specifications; replace any cylinder with low compression.
• Tools Required: Compression gauge, socket set.

5. Reassemble and Test

• Sub-steps:
  1. Reinstall any components removed during inspection.
  2. Reconnect the battery.
  3. Start the engine and allow it to reach operating temperature.
  4. Observe for any knocking noises and check for any leaks.
• Tools Required: None additional from previous steps.