Tundra 4WD V8-5.7L (3UR-FE) (2007)
Compression Check: Testing and Inspection
INSPECT COMPRESSION
(a)
Warm up and stop the engine.
(1) Allow the engine to warm up to a normal operating temperature.
(b) Remove the V-bank cover.
(c)
Remove the air cleaner hose assembly.
(d) Remove the air cleaner cap.
(e)
Disconnect the 2 injector connectors and 8 ignition coil connectors.
(f)
Remove the 8 bolts and 8 ignition coils.
(g) Remove the 8 spark plugs.
(h) Check the cylinder compression pressure.
NOTICE: Check each cylinder's compression pressure in the same way.
(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle.
(3) While cranking the engine, measure the compression pressure.
Standard compression pressure: 1300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure: 1000 kPa (10.2 kgf/cm2, 145 psi) or more
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi) or less
NOTICE:
^ Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
^ This measurement must be done as quickly as possible.
(4) 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.