Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTENGINECOMPRESSION CHECKTESTING AND INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Compression Check: Testing and Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
CHECK COMPRESSION
HINT: If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
a) Warm up and stop engine.
1) Allow the engine to warm up to normal operating temperature.
b) Remove spark plugs.
c) Check 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.
HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more.
4) Repeat steps (a) through (c) for each cylinder.
NOTICE: This measurement must be done in as short a time as possible.
Compression pressure: 1,373 kPa (14.0 kgf-cm2, 199 psi) or more
Minimum pressure: 1,030 kPa (10.5 kgf-cm2, 149 psi)
Difference between each cylinder: 98 kPa (1.0 kgf-cm2, 14 psi) or less
5) If the cylinder compression in one or more cylinders is low, pour small amount of engine oil into the cylinder through the spark plug hole and repeat steps (a) through (c) for cylinders with low compression.
^ If adding oil helps the compression, chances are that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
d) Reinstall spark plugs.
HINT: If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
a) Warm up and stop engine.
1) Allow the engine to warm up to normal operating temperature.
b) Remove spark plugs.
c) Check 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.
HINT: Always use a fully charged battery to obtain engine speed of 250 rpm or more.
4) Repeat steps (a) through (c) for each cylinder.
NOTICE: This measurement must be done in as short a time as possible.
Compression pressure: 1,373 kPa (14.0 kgf-cm2, 199 psi) or more
Minimum pressure: 1,030 kPa (10.5 kgf-cm2, 149 psi)
Difference between each cylinder: 98 kPa (1.0 kgf-cm2, 14 psi) or less
5) If the cylinder compression in one or more cylinders is low, pour small amount of engine oil into the cylinder through the spark plug hole and repeat steps (a) through (c) for cylinders with low compression.
^ If adding oil helps the compression, chances are that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
d) Reinstall spark plugs.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.