how to fix the P0302 misfire code on my Acura MDX YF3 (2022-Present)

Symptoms

• Check Engine Light (CEL) illuminated
• Rough idle or noticeable vibrations
• Loss of power during acceleration
• Increased fuel consumption
• Engine stalling

Diagnostic Steps

1. Scan for Error Codes: Use an OBD-II scanner to confirm the P0302 code and check for any additional codes that may indicate related issues.

2. Visual Inspection:

   • Inspect the engine bay for any obvious signs of damage or disconnected wires, particularly around cylinder 2.
   • Check for vacuum leaks around the intake manifold, which can contribute to misfires.

3. Check Spark Plug:

   • Remove the spark plug from cylinder 2 and inspect for fouling, wear, or damage.
   • Measure the gap using a feeler gauge to ensure it is within specifications.

4. Inspect Ignition Coil:

   • Remove the ignition coil from cylinder 2 and inspect it for cracks or damage.
   • Test the ignition coil with a multimeter to ensure it is functioning properly.

5. Fuel Injector Test:

   • Ensure the fuel injector for cylinder 2 is functioning. You can use a NOID light to check for electrical pulses.
   • Perform a fuel pressure test to ensure adequate fuel delivery.

6. Compression Test:

   • Conduct a compression test on cylinder 2 to rule out internal engine issues such as a burned valve or piston ring failure.

Repair Instructions

1. Replace Spark Plug: If the spark plug is fouled or worn beyond specifications, replace it with a new one (check the owner's manual for the correct part number).

   • Tools Required: Socket set, torque wrench, spark plug socket.
   • Time Estimate: 30 minutes.

2. Replace Ignition Coil: If the ignition coil is faulty, replace it with a new coil.

   • Tools Required: Socket set, torque wrench.
   • Time Estimate: 30-45 minutes.

3. Clean or Replace Fuel Injector: If the injector is clogged, clean it or replace it if necessary.

   • Tools Required: Fuel injector cleaner, or injector removal tools if replacing.
   • Time Estimate: 1-2 hours depending on accessibility.

4. Address Compression Issues: If the compression test reveals low compression, further diagnosis is required to determine if the head gasket, piston rings, or valves need repair.

   • Tools Required: Compression tester.
   • Time Estimate: 1-2 hours for diagnosis; repair time varies based on the issue.

Safety Warnings

• Always disconnect the negative battery terminal before performing electrical repairs to avoid shock or short circuits.
• Allow the engine to cool down before working on components to prevent burns.