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 DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGTESTING AND INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Spark Plug: Testing and Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECT SPARK PLUGS
a. Remove the ignition coils (with igniter).
b. Using a 16 mm plug wrench, remove the spark plugs.
c. Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.
Air pressure:
Below 588 kPa (6 kgf/sq.cm, 85 psi)
Duration:
20 seconds or less
HINT: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.
d. Check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.
e. Adjust the spark plug electrode gap.
Electrode gap for new spark plug:
1.0 to 1.1 mm (0.039 to 0.043 in.)
f. Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N.m (180 kgf.cm, 13 ft.lbf)
g. Reinstall the ignition coils (with igniter).
a. Remove the ignition coils (with igniter).
b. Using a 16 mm plug wrench, remove the spark plugs.
c. Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.
Air pressure:
Below 588 kPa (6 kgf/sq.cm, 85 psi)
Duration:
20 seconds or less
HINT: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.
d. Check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.
e. Adjust the spark plug electrode gap.
Electrode gap for new spark plug:
1.0 to 1.1 mm (0.039 to 0.043 in.)
f. Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N.m (180 kgf.cm, 13 ft.lbf)
g. Reinstall the ignition coils (with igniter).
RENDER: 1.0x
NO RELATED
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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.