how to diagnose engine misfire in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix engine misfire issues in Tesla Model S Plaid (2021-present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Inspect and Replace Ignition Components

• Sub-steps:
  1. Open the front trunk and locate the battery compartment.
  2. Disconnect the high-voltage battery using appropriate safety procedures.
  3. Remove the ignition coil connectors and inspect for corrosion or damage.
  4. Replace any damaged ignition coils with OEM parts.
• Tools Required: Socket set, torque wrench, safety gloves.

3. Check and Replace Spark Plugs

• Sub-steps:
  1. Remove the spark plug access cover.
  2. Using a spark plug socket, carefully remove the spark plugs.
  3. Inspect the spark plugs for wear or damage; replace if necessary.
  4. Gap the new spark plugs according to specifications and install them.
• Tools Required: Spark plug socket, feeler gauge.

4. Inspect High-Voltage Connections

• Sub-steps:
  1. Inspect all high-voltage connectors for corrosion or loose connections.
  2. Clean and tighten any loose connections.
  3. Ensure that the wiring harness is intact without any frays or breaks.
• Tools Required: Electrical contact cleaner, torque wrench.

5. Reconnect Battery and Test

• Sub-steps:
  1. Reconnect the high-voltage battery and ensure all connections are secure.
  2. Power on the vehicle and clear any stored error codes using the OBD-II scanner.
  3. Test drive the vehicle to monitor for any reoccurrence of the misfire.
• Tools Required: OBD-II scanner.