WOMS
P code powertrain Medium severity

P0317 Misfire Detected on Startup (First 2000 Revolutions)

The OBD2 code P0317 indicates that a misfire was detected during the first 2000 revolutions of the engine startup, suggesting that one or more cylinders are not firing properly when the engine is first started

Definition

The OBD2 code P0317 indicates that a misfire was detected during the first 2000 revolutions of the engine startup, suggesting that one or more cylinders are not firing properly when the engine is first started

Common causes

  • Faulty spark plugs
  • Ignition coil failure
  • Fuel delivery issues (clogged fuel filter, failing fuel pump)
  • Vacuum leaks
  • Faulty fuel injectors
  • Engine compression problems
  • Malfunctioning sensors (e.g., crankshaft position sensor)
  • Timing issues (e.g., timing belt/chain problems)
  • Dirty or faulty mass air flow sensor (MAF)
  • Engine control module (ECM) issues

Common misdiagnoses

  • Ignition coil failure
  • Spark plug issues
  • Fuel injector problems
  • Vacuum leaks
  • Engine compression issues
  • Faulty sensors (e.g., crankshaft or camshaft position sensors)
  • Fuel delivery problems
  • EGR system malfunctions
  • Timing belt/chain issues
  • Engine control module (ECM) faults

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Codes related to misfires (like P0300-P0308) can provide more specific information about which cylinder(s) are misfiring

  2. 2. Inspect Spark Plugs and Wires

  3. 3. Check the condition of the spark plugs. Look for signs of wear, fouling, or damage

  4. 4. Inspect the spark plug wires or ignition coils for any signs of wear, cracks, or corrosion

  5. 5. Examine Fuel System

  6. 6. Check the fuel injectors for proper operation. Ensure they are not clogged or leaking

  7. 7. Verify that the fuel pressure is within the manufacturer's specifications

  8. 8. Inspect the fuel filter for clogs or restrictions

  9. 9. Check for Vacuum Leaks

  10. 10. Inspect all vacuum hoses and intake manifold gaskets for leaks. A vacuum leak can cause a lean condition, leading to misfires

  11. 11. Inspect the Air Intake System

  12. 12. Ensure that the air filter is clean and not obstructed

  13. 13. Check the mass airflow sensor (MAF) for proper operation and cleanliness

  14. 14. Examine Engine Timing

  15. 15. Check the timing belt or chain for proper alignment and wear. Incorrect timing can lead to misfires

  16. 16. Test the Engine Compression

  17. 17. Perform a compression test on all cylinders to ensure they are within specifications. Low compression in one or more cylinders can indicate mechanical issues

  18. 18. Check for Engine Control Module (ECM) Issues

  19. 19. Ensure that the ECM is functioning properly and that there are no software issues. Sometimes, a reflash or update may be necessary

  20. 20. Inspect the Exhaust System

  21. 21. Check for any restrictions or blockages in the exhaust system, including the catalytic converter

  22. 22. Review Recent Repairs or Changes

  23. 23. If the issue started after recent repairs or changes, review those to ensure everything was reassembled correctly. 1

  24. 24. Test Drive and Monitor Data

  25. 25. After performing the above checks, take the vehicle for a test drive while monitoring live data from the OBD-II scanner. Look for any irregularities in engine performance, fuel trim, and misfire counts. 1

  26. 26. Consult Technical Service Bulletins (TSBs)

  27. 27. Check for any TSBs related to your vehicle's make and model that may address known issues with misfires. If the problem persists after these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair