how to troubleshoot P0301 misfire in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a flat surface and engage the parking brake.
• Disconnect the 12V battery to prevent electrical shorts.

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench
• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing the retaining bolts.
  2. Locate the ignition coil for cylinder 1 and disconnect its electrical connector.
  3. Remove the ignition coil by unscrewing it from the cylinder head.
  4. Inspect the coil for cracks or carbon tracking. Replace if damaged.
  5. Remove and inspect the spark plug for wear or damage. Replace if necessary, ensuring the gap meets specifications (typically 0.040 inches).

3. Inspect Fuel Injector

• Tools Required: Fuel injector removal tool (if necessary)
• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector for cylinder 1.
  2. Remove the fuel rail (if required) to access the injector.
  3. Inspect the fuel injector for clogs, using a multimeter to test for resistance (typically 12-16 ohms).
  4. Clean or replace the injector if it is faulty.

4. Perform Compression Test

• Tools Required: Compression tester
• Sub-steps:
  1. Remove the spark plug for cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for several seconds and note the pressure reading.
  4. Compare the reading to manufacturer specifications. If low, further investigation of the engine internals may be required.

5. Reassemble and Test

• Sub-steps:
  1. Reinstall all components in reverse order, ensuring all connections are secure.
  2. Reconnect the 12V battery.
  3. Start the vehicle and monitor for check engine light status and engine performance.