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Home >> Kia >> 2021 >> Sedona EX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (4 Of 7) >> DTC P0300-00: Random/Multiple Cylinder Misfire Detected >> System Inspection >> Engine Compression Test
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Engine Compression Test

  1. Warm up the engine to normal operating temperature.
  2. Remove the fuel pump fuse.
  3. Wait until the engine stopped.
  4. Remove the ignition coils and spark plugs.
  5. Crank the engine to remove any foreign material in the cylinders.
  6. Put a compression pressure gauge into spark plug hole.
  7. Check compression pressure at each cylinder.

    Specification:  14kg/cm2 (250 to 400 RPM)

    Good 

    No Good 

    • Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
    • If the compression on each cylinder is not the same or not similar a burnt or defective valve seat, worn head gasket and pressure rings can be the cause of vibration of engine.
    • Repair or replace as necessary and go to "VERIFICATION OF REPAIR " procedure.
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