Spark Plug: Testing and Inspection

NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10 °C (14 °F) to 50 °C (122 °F) and "Hot" is from 50 °C (122 °F) to 100 °C (212 °F).


INSPECT SPARK PLUGS
a. Remove the ignition coils (with igniter).







b. Using a 16 mm (0.63 in.) plug wrench, remove the spark plugs.







c. Clean the spark plugs.

If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.

Air pressure: Below 588 kPa (6 kgf/sq.cm, 85 psi)

Duration: 20 seconds or less

HINT: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.

03 PRIUS 1.5L (1NZ-FXE) [Hybrid]:

d. Check the spark plug for thread damage and insulator damage.

If abnormal, replace the spark plug.







e. Check the electrode gap.

Electrode gap: 1.0 - 1.1 mm (0.039 - 0.043 in.)

Maximum electrode gap: 1.2 mm (0.047 in.)

If the electrode gap is greater than maximum, replace the spark plug.

f. Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.

Torque: 18 N.m (184 kgf.cm, 13 ft.lbf)

g. Install the ignition coils (with igniter).