how to diagnose the engine misfire in my Acura MDX YF3 (2022-Present) with code P0303

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench, ignition coil puller.
• Remove the engine cover if applicable.
• Remove the ignition coil for cylinder 3 by unbolting and gently pulling it out.
  • Note: Keep track of bolts and components removed.
• Inspect the spark plug for damage or wear; replace if necessary.
• Check the ignition coil for cracks or internal failure; replace if needed.

3. Check Fuel Injector

• Tools Required: Fuel injector puller, multimeter.
• Disconnect the fuel injector connector for cylinder 3.
• Use a multimeter to check for continuity and resistance of the injector.
• If the injector is faulty, remove it using a fuel injector puller and replace with a new one.

4. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 3.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and record the compression reading.
• Compare the reading to manufacturer specifications; replace the cylinder head gasket or piston rings if compression is low.

5. Verify Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position (do not start) and check for proper fuel pressure.
• If pressure is low, check the fuel pump operation and replace if necessary.