Sequoia LTD 4WD V8-4.7L (2UZ-FE) (2001)
Spark Plug: Testing and Inspection
ON-VEHICLE INSPECTION
NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10 °C (14 °F) to 50 °C (122 °F) and
"Hot" is from 50 °C (122°F) to 100 °C (212 °F).
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 kg/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.