RX 300 FWD V6-3.0L (1MZ-FE) (1999)
Spark Plug: Testing and Inspection
INSPECT SPARK PLUGS
NOTE:
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Never use a wire brush for cleaning.
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Never attempt to adjust the electrode gap on used spark plug.
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Spark plug should be replaced every 100,000 (60,000 miles).
a. Remove the ignition coil with igniters.
b. Check the electrode.
Using a megger (insulation resistance meter), measure the insulation resistance.
Correct insulation resistance:
10 MOhm or more
If the resistance is less than specified, proceed to step (d).
HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.
Simple Method:
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Quickly race the engine to 4,000 rpm 5 times.
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Remove the spark plug. (See step (c))
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Visually check the spark plug. If the electrode is dry ... Okay.
If the electrode is wet... Proceed to step (d).
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Reinstall the spark plug. (See step (g))
c. Using a 16 mm plug wrench, remove the spark plugs.