Basically, misfires are caused by one of three things, loss of spark, air/fuel mixture or loss of compression.

So, There are a lot of different things that could cause engine misfires.

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Common Causes Of Engine Misfiring

So, Where should you start looking for the problem:

  • Bad Ignition Coil
  • Bad Spark Plugs
  • Intake Manifold Gasket Leaks
  • Low Fuel Pressure
  • Injector Problem
  • Low Compression

So, Engine misfires happen when one of the cylinders in your engine fails to function properly. And, When you have a misfire, the engine will run off balance, creating a powerful vibration. As a result, The amount of power the engine can produce will drop significantly.

So, Misdiagnosing or ignoring a misfire can be very expensive. Furthermore, The parts required to repair a misfire can be expensive. Also, Replacing the wrong parts does not address the cause of the misfire, possibly causing further damage to the vehicle.

Finally, Here are some common (DTC)s you may find in your vehicle’s computer that can help diagnose a misfire:

  • P0100-P0104: Mass air flow sensor related codes.
  • P0171 or P0172: Lean or rich fuel conditions.
  • P0200 code series: Fuel injector circuit malfunctions.
  • P0220-P0229: Throttle or pedal position sensor related codes.
  • P0300: Multiple, random misfires.
  • P0301-P0312: The last two digits point to the cylinder number where a misfire happened.
  • P0335-P0339 – Crankshaft position sensor related codes
  • P0400: Some codes in this series indicate an EGR system malfunction.

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