how to fix the unstable idle in my Acura MDX YF3 (2022-Present)

Solution

1. Preparation

• Ensure the engine is cool and the vehicle is parked on a level surface.
• Disconnect the battery to prevent electrical shorts while working.

2. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set.
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner onto a soft cloth and wipe the throttle body and the blade until clean.
• Ensure the throttle blade opens and closes freely without any obstruction.
• Reattach the air intake duct and reconnect the battery.

3. Clean or Replace the Idle Air Control Valve (IACV)

• Tools Required: Socket set, gasket scraper, new gasket (if replacing IACV).
• Locate the IACV; it is typically mounted on the intake manifold.
• Disconnect the electrical connector and remove the IACV.
• If cleaning, use throttle body cleaner to clean the IACV passages; if replacing, install the new IACV with a new gasket.
• Reconnect the electrical connector and ensure it is secure.

4. Inspect Spark Plugs and Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the engine cover to access spark plugs.
• Inspect each spark plug for wear and carbon buildup; replace if necessary.
• Check ignition coils for any signs of damage or corrosion; replace any faulty coils.
• Reinstall the spark plugs and engine cover, ensuring proper torque specifications are followed.

5. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "on" position without starting the engine to check fuel pressure.
• Refer to manufacturer specifications for acceptable fuel pressure range; replace fuel pump if pressure is out of range.