Engine Compression Inspection

Engine Compression Inspection

1.Warm up the engine to normal operating temperature (cooling fan comes on).

2.Turn the ignition switch OFF.

3.Remove the PGM-FI main relay 2.

4.Start the engine, and let it run until it stalls.

5.Remove the four front ignition coils.

6.Remove the four front spark plugs.

7.Attach the compression gauge to the spark plug hole.

NOTE: Use a compression gauge of which connecting length (between the edge and the flange) is less than 23 mm (0.9 in.).


8.Connect a tachometer.

9.Open the throttle fully, then crank the engine with the starter motor and measure the compression.

Compression Pressure: 
Above 980 kpa (10.0 kgf/cm2, 142 psi)-250 rpm 

10.Measure the compression on the remaining cylinders.

Maximum variation: 
Within 200 kPa (2.0 kgf/cm2, 28 psi) 

11.If the compression is not within specifications, check the following items, then remeasure the compression.

  • Damaged or worn valves and seats
  • Damaged cylinder head gasket
  • Damaged or worn piston rings
  • Damaged or worn piston and cylinder bore