Sienna LE V6-3.0L (1MZ-FE) (1998)
Spark Plug: Testing and Inspection
INSPECTION
INSPECT SPARK PLUGS
NOTICE:
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Never use a wire brush for cleaning.
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Never attempt to adjust the electrode gap on a use spark plug.
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Spark plugs should be replaced every 100,000 km (60,000 miles).
(a) Remove the high-tension cords set.
(b) Remove the ignition coils.
(c) Inspect the electrode.
Using a megger (insulation resistance meter), measure the insulation resistance.
Standard correct insulation resistance: 10 M ohms or more
If the resistance is less than specified, proceed to step (e).
HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.
(d) Simple Method:
(1) Quickly race the engine to 4,000 rpm 5 times.
(2) Remove the spark plug.
If the electrode is dry ... OK
If the electrode is wet... Proceed to Step (f)
(4) Install the spark plug.
(e) Using a 16 mm plug wrench, remove the 6 spark plugs from the RH and LH cylinder heads.
(f) Check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.