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Engine Performance Troubleshooting

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Misfire

 

PCM Won’t Indicate a Misfire?
  • Low Fuel
    • On some Fords if fuel level is 15% or less or fuel gauge is not working, PCM doesn’t monitor misfire.

 

    Stalling

    • When pulling to a stop
      • Bad TPS
      • Bad EGR
        • ➱ EGR Troubleshooting
      • Stuck Torque Converter Clutch Solenoid
        • Try unplugging TC solenoid and see if the problem remains.
        • Low transmission fluid.
      • When warm
        • Shorted Injectors
          • Ok when cold

       

      Surging

      • At idle

        • Bad ECT Sensor
        • MDS Lifters problems (Chrysler)
        • Idle Air Control
        • Front O2 Sensor

      Lack of Power

      • Air flow
        • ➱ Timing Troubleshooting
        • EGR flow problems
        • Restricted intake, exhaust
        • Incorrect Timing
      • Fuel flow (low fuel pressure)
      • Engine Timing
      • Ignition (bad coil)
        • ➱ Ignition Troubleshooting
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