why does my Acura MDX YF3 (2022-Present) make a knocking noise when I accelerate

Symptoms

• Knocking or rattling noise that increases with acceleration
• Possible loss of power or hesitation while accelerating
• Engine vibrations felt through the steering wheel or floor
• Engine misfire or rough idle (in some cases)
• Check engine light illuminated (if associated with engine issues)

Diagnostic Steps

1. Visual Inspection:

   • Check for any visible signs of damage under the hood, particularly around the engine and transmission mounts.
   • Inspect the exhaust system for loose parts or damage.

2. Scan for Error Codes:

   • Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) that may indicate underlying engine or transmission issues.

3. Listen for Noise Location:

   • While the engine is running, try to identify if the noise is coming from the engine bay, transmission, or underneath the vehicle.
   • Have an assistant accelerate the engine while you listen for the noise.

4. Check Engine and Transmission Mounts:

   • Inspect the engine and transmission mounts for wear or damage. A failed mount can cause knocking noises during acceleration.

5. Examine the Drivetrain:

   • Check for any issues with the driveshaft, CV joints, and differential. Look for any signs of wear, play, or damage.

6. Test Drive:

   • Conduct a test drive to replicate the noise. Pay attention to the vehicle’s performance, including acceleration and shifting.

Repair Instructions

1. Addressing Engine/Transmission Mount Issues:

   • Tools Required: Socket set, torque wrench, jack stands, and a floor jack.
   • Time Estimate: 1-2 hours.
   • Procedure:
     • Raise the vehicle securely using jack stands.
     • Remove the necessary components to access the engine/transmission mounts.
     • Unbolt the damaged mount and replace it with a new one, ensuring proper alignment.
     • Torque bolts to the manufacturer’s specifications.
     • Reassemble any components removed for access.

2. If Related to an Exhaust Issue:

   • Tools Required: Wrench set, exhaust hanger removal tool.
   • Time Estimate: 1 hour.
   • Procedure:
     • Inspect the exhaust system for loose connections or damaged components.
     • Tighten any loose bolts or replace damaged hangers/mounts.
     • If necessary, replace any damaged exhaust sections.

3. If Related to Drivetrain Components:

   • Tools Required: Socket set, dial gauge (for play measurement), and possibly a torque wrench.
   • Time Estimate: 2-3 hours, depending on the severity.
   • Procedure:
     • Inspect CV joints and driveshaft for damage.
     • If play is detected, replace the affected CV joint or driveshaft.
     • Ensure all components are properly torqued to specifications.

Safety Warnings

• Always work on a vehicle that is securely lifted with jack stands; never work under a vehicle supported only by a jack.
• Wear appropriate personal protective equipment (PPE) such as gloves and safety glasses.
• Be cautious of hot engine components and sharp edges when working under the hood or vehicle.