Spark Plug: Service and Repair

Changing Spark Plugs

1. Disconnect ignition wires from spark plugs at boot.
Do not pull on the wire.
2. Remove spark plugs with 16 mm (0.63 in) spark plug wrench.
- For VG33ER engine only; to remove the No. 2, and 4 spark plugs, the following components must be removed:

a. Disconnect the accelerator cable from the throttle body and the air inlet tube bracket.
b. Disconnect the ASCD cable from the throttle body and the air inlet tube bracket, if equipped.

c. Remove the air inlet duct.
- Disconnect the PCV hoses.
- Disconnect the resonator hose.

d. Remove the air inlet tube upper and lower supports.

e. Remove the air inlet tube bolts, nuts, and studs. Position the air inlet tube aside.
- Disconnect the evaporative emission vacuum hose.
- Disconnect the brake booster vacuum hose.
- Disconnect the TPS sensor electrical connector.
- Disconnect the TPS switch electrical connector.

Spark Plug:

3. Check type and gap of new spark plug.

Use standard type spark plug under normal conditions.
The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions such as:
- frequent engine starts
- low ambient temperatures

The cold type spark plug is suitable when spark knock occurs with the standard type spark plug under conditions such as:
- extended highway driving
- frequent high engine revolution

- Do not use a wire brush for cleaning.
- If plug tip is covered with carbon, spark plug cleaner may be used.

Cleaner air pressure:
Less than 588 kPa (6 kg/cu.cm, 85 psi)
Cleaning time:
Less than 20 seconds

- Checking and adjusting plug gap is not required between spark plug change intervals.
When installing spark plugs to No. 2 and 4 cylinders, securely fit each ignition wire mounting hole onto the ignition wire fixing pin.

Spark plug:
Tightening Torque: 20 - 29 N.m (2.0 - 3.0 kg-m, 14 - 22 ft-lb)