Celica GT Ltd Ed Convertible L4-2164cc 2.2L DOHC MFI (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 a used spark plug.
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Spark plugs should be replaced every 100,000 km (60,000 miles).
1. DISCONNECT HIGH-TENSION CORDS FROM SPARK PLUG
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 5.
HINT: If a megger is not available, the following simple method of inspection provides fairly accurate results.
Simple Method:
(a) Quickly race the engine to 4,000 rpm 5 times.
(b) Remove the spark plug. (See step 3)
(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. (See step 7)
3. REMOVE SPARK PLUGS
Using a 16 mm plug wrench, remove the 4 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:
