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Compression Check

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Warm up engine to normal operating temperature.
  2. Stop engine after warm-up.
  3. For CVT model, place select lever in "P" and apply parking brake.

    For M/T model, place gear shift lever in "Neutral" and apply parking brake.

  4. Remove engine cover. Refer to Air Cleaner Assembly Removal and Installation .
  5. Remove all ignition coils and spark plugs.
  6. Disconnect all fuel injector connectors.
  7. Install special tools into spark plug hole.

    Special Tool 

    1. 09915-64512 
    2. 09915-64530 
    3. 09915-67010 
      Fig 1: Identifying Special Tools Into Spark Plug Hole
      G06866910Courtesy of SUZUKI OF AMERICA CORP.
  8. Depress accelerator pedal all the way to fully open throttle.
    NOTE: For M/T model, disengage clutch to lighten starting load on engine, and depress accelerator pedal all the way to fully open throttle.
  9. Crank engine with fully charged battery, and read the highest pressure on compression gauge.
    NOTE:
    • For measuring compression pressure, crank engine at least 200 rpm by using fully charged battery.
    • If measured compression pressure is lower than limit value, check installation condition of special tool.
    • If the measured compression pressure of particular cylinder is lower than limit, add a bit of engine oil into the cylinder through the spark plug hole, and then repeat the compression check.
      • If the compression pressure increases after adding engine oil, there is possibility of the following cause.
        • The pressure leakage is caused by worn piston rings or worn cylinder.
      • If the compression pressure does not increase significantly, there is possibility of the following causes.
        • Incorrect valve timing.
        • The pressure leakage is at the valves and the valve seats.
        • The pressure leakage is at the cylinder head gasket.

    Compression pressure 

    Standard: 1,400 kPa (14.3 kgf/cm 2  , 203 psi) 

    Limit: 1,100 kPa (11.2 kgf/cm 2  , 160 psi) 

    Max. difference between any two cylinders: 100 kPa (1.02 kgf/cm 2  , 14.5 psi) 

  10. Carry out Steps  7) through  9) on each cylinder.
  11. Install spark plugs and ignition coil assemblies.
  12. Connect fuel injector connectors.
  13. Install engine cover.
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