Tundra 4WD V8-5.7L (3UR-FE) (2007)
Spark Plug: Testing and Inspection
ON-VEHICLE INSPECTION
1. INSPECT SPARK PLUG
NOTE:
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Do not use a wire brush for cleaning.
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Do not attempt to adjust the electrode gap of a used spark plug.
a. Check the electrode.
1. Using a megohmmeter, measure the insulation resistance.
If the insulation resistance is the specified range, replace the spark plug.
HINT: If a megohmmeter is not available, perform the given simple inspection instead.
b. Alternative inspection method:
1. Quickly accelerate the engine to 4000 rpm 5 times.
2. Remove the spark plug.
3. Visually check the spark plug.
If the electrode is dry, the spark plug is functioning properly. If the electrode is damp,proceed to the next step.