IS 250 RWD V6-2.5L (4GR-FSE) (2007)
Spark Plug: Testing and Inspection
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.
Insulation resistance: 10 MOhms or more
HINT: If a megohmmeter is not available, perform the following simple inspection instead.
b. Alternative inspection method:
1. Quickly accelerate the engine to 4,000 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.
c. Check the spark plug for any damage to its threads and insulator.
HINT: If there is any damage, replace the spark plug. If not, reinstall the spark plug.