SPARK PLUG INSPECTION [L3, AJ (3.0L Duratec)]

Specification

Plug Gap Inspection

Caution

• To prevent the tip from being damaged, do not adjust the plug gap.

• To prevent the tip from being damaged, measure a plug gap using the wire plug gap gauge.

1. Measure the spark plug gap using a wire plug gap gauge.

• If the gap is not within the specification, replace the spark plug.

Standard plug gap

L3: 1.25-1.35 mm {0.050-0.053 in}

AJ (3.0L Duratec): 1.32-1.42 mm {0.052-0.055 in}

Cleaning

Caution

• To prevent the tip from being damaged, do not clean using a wire brush.

Note

•  When cleaning the spark plugs, use gasoline.

Visual Inspection

1. Inspect the following items:

• If there is any malfunction, replace the spark plug.

- Insulator breakage

- Worn out electrode

- Damaged gasket

- Badly burned insulator (sparking side)

Resistance Inspection

1. Measure the spark plug resistance using a tester as shown in the figure.

• If it is not within the specification, replace the spark plug.

Resistance

L3: 3.0-7.5 kilohms [20 °C {68 °F}]

AJ (3.0L Duratec): 2.0-20.0 kilohms [25 °C {77 °F}]