Compression Check: Testing and Inspection

INSPECT COMPRESSION
(a) Warm up and stop the engine.

NOTICE: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.

(b) Disconnect the injector connectors.
(c) Remove the intake air surge tank.
(d) Remove the 6 ignition coils.
(e) Remove the 6 spark plugs.
(f) Inspect the cylinder compression pressure.





(1) Insert a compression gauge into the spark plug hole.
(2) While cranking the engine, measure the compression pressure.

HINT: Always use a fully charged battery to obtain an engine speed of 250 rpm or more.

NOTICE: The measurement must be done as quickly as possible.

Compression pressure: 1,400 kPa (14 kgf/cm2, 199 psi) or more
Minimum pressure: 980 kPa (10.0 kgf/cm2, 142 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi) or less
(3) Perform the inspection above for each cylinder.
(4) 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. Then perform the first 3 steps under "Inspect the cylinder compression pressure" for the cylinders with low compression.

HINT:
^ 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 stuck or seated improperly, or there may be leakage in the gasket.

(g) Install the 6 spark plugs.
(h) Install the 6 ignition coils.
(i) Install the intake air surge tank.
(j) Connect the injector connectors.