Engine Compression

Check engine compression with engine at normal operating temperature at specified cranking speed with all spark plugs removed (on dual plugs, remove exhaust side only) and throttle wide open. Ensure battery is fully charged and disconnect ignition coil primary connector.
On Swift models, remove main relay fuse (15-amp) from fuse box in engine compartment. Crank engine until maximum pressure is reached at each cylinder. Lowest cylinder pressure should be at least 75% that of the highest cylinder pressure. On manual transmissions, disengage clutch to lighten starting load on engine.

ENGINE COMPRESSION TEST

Model

Standard psi (kg/cm² )

⁽¹⁾ Minimum psi (kg/cm² )

Samurai

199 (14.0)

170 (11.9)

⁽¹⁾	Maximum variation between cylinders is 14.2 psi (1.0 kg/cm² ).