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HOMESERVICE MANUALSKIA2017RIO EX, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALMECHANICALENGINE MECHANICAL SYSTEM - GENERAL INFORMATIONCOMPRESSION TESTCOMPRESSION PRESSURE INSPECTION
2017 Kia Rio EX, 4D Hatchback

Compression Pressure Inspection

2017 Kia Rio EX, 4D HatchbackSECTION Compression Pressure Inspection
NOTE: If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
  1. Make sure the oil in the crankcase is of the correct viscosity and at the correct level and that the battery is correctly charged. Operate the vehicle until the engine is at normal operating temperature. Turn the ignition switch to the OFF position.
  2. Remove the engine cover.
  3. Disconnect the injector extension connector (A) and the ignition coil connectors (B).
    Fig 1: Locating Injector Extension Connector And Ignition Coil Connectors
    G11844542Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove the ignition coils (A).
    Fig 2: Removing Ignition Coils
    G11844543Courtesy of KIA MOTORS AMERICA, INC.
  5. Remove the spark plugs.

    Using a 16 mm plug wrench, remove the 4 spark plugs.

  6. Check the cylinder compression pressure.
    1. Insert a compression gauge into the spark plug hole.
      Fig 3: Inserting Compression Gauge Into Spark Plug Hole
      G11844544Courtesy of KIA MOTORS AMERICA, INC.
    2. Set the throttle plate in the wide-open position.
    3. While cranking the engine, measure the compression pressure.
      NOTE: Always use a fully charged battery to obtain engine speed of 250 RPM or more.
    4. Repeat step  1) through  3) for each cylinder.
      NOTE: This measurement must be done in as short time as possible.

      Compression pressure 

      Standard: 1225.83 kPa (12.5 kg/cm2 , 177.79 psi) (200 ~ 250 RPM)

      Minimum: 1078.73 kPa (11.0 kg/cm2 , 156.46 psi)

      Difference between each cylinder:

      98 kPa (1.0 kg/cm2 , 14 psi) or less

    5. If the cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat step  1) through  3) 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.
  7. Install the spark plugs.

    Tightening torque: 

    7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

  8. Install the ignition coil.

    Tightening torque: 

    9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

  9. Connect the injector extension connector and the ignition coil connectors.
  10. Install the engine cover.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.