Previa Van LE 4WD L4-2438cc 2.4L DOHC SC MFI (1997)
Spark Plug: Testing and Inspection
SPARK PLUGS INSPECTION
NOTICE:
-
Never use a wire brush for cleaning.
-
Never attempt to adjust the electrode gap on a used spark plug.
-
Spark plugs should be replaced every 100,000 km (60,000 miles).
1. 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 2.
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 2)
(c) Visually check the spark plug.
If the electrode is dry ... Okay
If the electrode is wet ... Proceed to step 3
(d) Reinstall the spark plug. (See step 6)
2. Remove spark plugs.
Using a 16 mm plug wrench, remove the spark plug.
3. Visually inspect spark plugs.
Check the spark plug for thread damage and insulator damage.
If abnormal, replace the spark plug.
Recommended spark plug:
ND PK20R11
