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Home >> Hyundai >> 2025 >> Kona SEL, 4WD >> Repair and Diagnosis >> General Information >> Engine >> Engine Mechanical System 2.0 - General Information >> Inspection >> Compression Pressure Inspection

Compression Pressure Inspection

CAUTION:
  • If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
  1. Start the engine and turn the coolant temperature to 80 - 95°C and stop.
  2. Disconnect the injector connector (A).
    G16548671Courtesy of HYUNDAI MOTOR AMERICA
  3. Remove spark plugs.

    (Refer to Engine Electrical System - "SPARK PLUG ")

  4. Check the cylinder compression pressure.
    1. Insert a compression gauge into the spark plug hole.
      G16548672Courtesy of HYUNDAI MOTOR AMERICA
    2. While cranking the engine, measure the compression pressure.
      NOTE:
      • Always use a fully charged battery to obtain engine speed of 200 rpm or more.
    3. Repeat steps (1) through (2) for each cylinder.
      NOTE:
      • This measurement must be done in as short a time as possible.

      Compression pressure 

      Standard: 1275 kPa (13.0 kgf/cm2 , 185 psi)

      Minimum: 1128 kPa (11.5 kgf/cm2 , 164 psi)

      Difference between each cylinder: 98 kPa (1.0 kgf/cm2 , 14 psi) or less

    4. If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (1) through (2) for cylinders with low compression.
      • If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
      • If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
  5. Install in the reverse order of removal.
  6. Some DTCs may exist after the inspection test and may need to be manually cleared with diagnostic tool.
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