COMPRESSION CHECK NOTE: If there is lack of power, excessive oil consumption or poor fuel mileage, measure the cylinder compression pressure. 1. WARM UP ENGINE 2. REMOVE SPARK PLUGS 3. DISCONNECT HIGH-TENSION CORD FROM DISTRIBUTOR 4. MEASURE CYLINDER COMPRESSION PRESSURE (a) Insert a compression gauge into the spark plug hole. (b) Fully open the throttle valve. (c) While cranking the engine with the starter motor, measure the compression pressure. NOTE: Always use a fully charged battery to obtain engine revolution of more than 250 rpm. (d) Repeat steps (a) through (c) for each cylinder. Compression pressure: 11.5 kg/cm² (164 psi, 1,128 kPa) or 9.0 kg/cm² (128 psi, 883 kPa) Difference between each cylinder: Less than 1.0 kg/cm² (14 psi, 98 kPa) (e) If 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 steps (a) through (c) for the cylinder with low compression. • If adding oil helps the compression, changes are that the piston rings and/or cylinder bore are worn or damaged. • If pressure stays low, a valve may be sticking or seated improperly, or there may be leakage past the gasket.