LS 460 V8-4.6L (1UR-FSE) (2007)
HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more.
NOTICE: The measurement must be done as quickly as possible.
Standard compression pressure: 1400 kPa (14.2 kgf/cm2, 203 psi) or more
Minimum pressure: 980 kPa (9.9 kgf/cm2, 142 psi)
(5) Turn the engine switch off.
(6) Disconnect the cable from the negative (-) battery terminal.
(7) Remove the battery and tray.
(8) Remove the compression gauge.
(q) Cylinder other than cylinder under the battery installation position:
Inspect the compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Install the battery and tray.
(3) Connect the cable to the negative (-) battery terminal.
(4) Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure.
HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more.
NOTICE: The measurement must be done as quickly as possible.
Standard compression pressure: 1400 kPa (14.2 kgf/cm2, 203 psi) or more
Minimum pressure: 980 kPa (9.9 kgf/cm2, 142 psi)
(5) Remove the compression gauge.
(6) Perform the inspection above for each cylinder.
(7) Check the pressure difference between each compression pressure.
Pressure difference: 100 kPa (1.0 kgf/cm2, 14.5 psi) or less
(8) If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression
through its spark plug hole. Then inspect the cylinder compression pressure again.
HINT:
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If adding oil helps boost 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.
(9) Disconnect the cable from the negative (-) battery terminal.
(10) Remove the battery and tray.