Yaris L4-1.5L (1NZ-FE) (2007)
Compression Check: Testing and Inspection
INSPECT COMPRESSION
(a)
Warm up and stop the engine.
(b) Remove cylinder head cover No. 2.
(c)
Remove the 4 ignition coils.
(d) Remove the 4 spark plugs.
(e)
Disconnect the 4 fuel injector connectors.
(f)
Inspect the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle.
(3) While cranking the engine, measure the compression pressure.
Compression: 1,471 kPa (15.0 kgf/cm2, 213 psi)
Minimum pressure: 1,079 kPa (11.0 kgf/cm2, 156 psi)
Difference between each cylinder: 98 kPa (1.0 kgf/cm2, 14 psi) or less
NOTICE:
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Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.
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Inspect the other cylinders in the same way.
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Measure the compression in as short a time as possible.
(4) If the cylinder compression is low, pour a light coat of engine oil into the cylinder through the spark plug hole, then inspect it again.
HINT:
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If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
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If the pressure stays low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.
(g) Connect the 4 fuel injector connectors.
(h) Install the 4 spark plugs.
Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf)
(i)
Install the 4 ignition coils.
(j)
Install cylinder head cover No. 2.