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Home >> Kia >> 2004 >> Amanti >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> Diagnosis >> DTC P0301: Cylinder 1 Misfire Defected >> Inspection/Repair >> System Inspection >> Check Engine Compression

Check Engine Compression

  1. Start the engine and wait until the engine coolant temperature reaches 80~95 °C (176~205 °F).
  2. Start the engine and disconnect the spark plug cables.
  3. Remove the spark plugs.
  4. Crank the engine to remove any foreign material in the cylinders.
  5. Insert the compression gauge into the spark plug hole.
  6. Depress the accelerator pedal to open the throttle fully.
  7. Insert the compression gauge into the spark plug hole.
  8. Crank the engine and read the gauge.
    1. Specification: 1,275 kPa (13.0 kg/cm2 , 185 psi)
    2. Limit: 1,128 kPa (11.5 kg/cm2 , 164 psi)
      Fig 1: Checking Engine Compression
      G07330528
  9. Check that the pressure differences of the cylinders are below the limit.
    1. Specification: 100 kPa (1.0 kg/cm2 , 14 psi)
  10. Is a cylinder's compression or pressure differential outside the specification?

    YES

    • add a small amount of oil through the spark plug hole, and repeat above steps.
    1. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
    2. If the compression remains the same, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket.

    NO

    1. Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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