why does my Acura MDX YF3 (2022-Present) engine hesitate during acceleration

Symptoms

• Hesitation or stumbling when accelerating
• Engine misfire (may feel like a loss of power)
• Rough idle or irregular engine performance
• Check Engine Light (CEL) may be illuminated
• Possible poor fuel economy

Diagnostic Steps

1. Check Engine Light: Use an OBD-II scanner to check for any stored error codes that could indicate specific issues with the engine or transmission.
2. Inspect Fuel System: Check the fuel level and condition. Low fuel or contaminated fuel can cause hesitation.
3. Test Air Intake System: Inspect the air filter for blockage and ensure the intake system is free of leaks.
4. Evaluate Ignition Components: Inspect spark plugs, ignition coils, and wires for wear or damage.
5. Examine Throttle System: Check the throttle body for carbon buildup and ensure the throttle position sensor (TPS) is functioning correctly.
6. Assess Engine Sensors: Test the Mass Air Flow (MAF) sensor and the Engine Coolant Temperature (ECT) sensor for proper operation using a multimeter.
7. Inspect Transmission Fluid: Ensure the transmission fluid is at the correct level and in good condition (not burnt or contaminated).

Repair Instructions

1. Retrieve Error Codes:

   • Tools Required: OBD-II Scanner
   • Estimated Time: 5-10 minutes
   • Steps: Connect the OBD-II scanner to the vehicle’s diagnostic port, turn on the ignition, and read any stored codes.

2. Inspect and Replace Fuel Filter (if needed):

   • Tools Required: Socket set, replacement fuel filter (if clogged)
   • Estimated Time: 30-45 minutes
   • Steps:
     • Relieve fuel system pressure.
     • Disconnect the battery.
     • Remove the fuel filter and install the new one.
     • Reconnect the battery and check for leaks.

3. Clean Throttle Body:

   • Tools Required: Throttle body cleaner, soft cloth, socket set
   • Estimated Time: 30 minutes
   • Steps:
     • Disconnect the battery and intake hose.
     • Remove the throttle body from the intake manifold.
     • Clean the throttle body with the cleaner and a cloth.
     • Reinstall the throttle body and reconnect hoses.

4. Replace Spark Plugs and Ignition Coils (if necessary):

   • Tools Required: Socket set, torque wrench, replacement spark plugs, ignition coils
   • Estimated Time: 1-2 hours
   • Steps:
     • Remove the engine cover (if applicable).
     • Disconnect the ignition coils and remove them.
     • Unscrew and replace spark plugs.
     • Reinstall ignition coils and reconnect wiring.

5. Test and Replace MAF Sensor (if faulty):

   • Tools Required: Multimeter, replacement MAF sensor (if defective)
   • Estimated Time: 30 minutes
   • Steps:
     • Disconnect the MAF sensor and test it using a multimeter.
     • If it’s out of spec, replace it with a new sensor.

Safety Warnings

• Always perform repairs in a well-ventilated area and wear appropriate safety equipment (gloves, goggles).
• Disconnect the battery before performing work on the electrical system.
• Be cautious when working with fuel systems to avoid fire hazards.