Celica GT Liftback L4-2164cc 2.2L DOHC MFI (1998)
Spark Plug: Testing and 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 used spark plug.
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Spark plugs should be replaced every 100,000 km (60,000 miles).
(a) Disconnect the high-tension cords from the spark plugs.
(b) 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 (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.
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Visually check the spark plug. If the electrode is dry ... OK
If the electrode is wet... Proceed to step (d)
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Reinstall the spark plug.
(c) Using a 16 mm plug wrench, remove the 4 spark plugs.
(d) Visually check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.
