GX 470 V8-4.7L (2UZ-FE) (2004)
Spark Plug: Testing and Inspection
INSPECT SPARK PLUG
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 200,000 km (120,000 miles).
a. Check the electrode.
1. Using a Ohmmeter, measure the insulation resistance. Correct insulation.
resistance: 10 MOhm or more
If the resistance is less then specified, proceed to step (d).
HINT: If a Ohmmeter is not available, the following simple method of inspection provides fairly accurate results.
b. Simple Method:
1. Quickly race the engine to 4,000 rpm 5 times.
2. Remove the spark plug.
3. Visually check the spark plug.
4. If the electrode is dry...OK.
5. If the electrode is wet...Proceed to step (C).
6. Reinstall the spark plug.