Supra Liftback L6-2997cc 3.0L DOHC MFI Twin-Turbo (1997)
Spark Plug: Testing and Inspection
SPARK PLUGS INSPECTION
NOTICE:
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Never use a wire brush for cleaning.
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Never attempt to adjust the electrode gap on used a spark plug.
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Spark plugs should be replaced every 100,000 km (60,000 miles).
1. REMOVE IGNITION COILS ASSEMBLIES
2. INSPECT 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 3.
HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.
Simple Method:
(a) Quickly race the engine 5 times to 4,000 rpm.
(b) Remove the spark plug.
(c) Visually check the spark plug.
If the electrode is dry ... OK
If the electrode is wet ... Proceed to step 4
(d) Reinstall the spark plug.
3. REMOVE SPARK PLUGS
4. VISUALLY INSPECT SPARK PLUGS
Check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.
Recommended spark plug:
