Spark Plug Replacement for Chevrolet Impala 2009

Caution: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.

1. Remove the spark plug wire. Refer to Spark Plug Wire Replacement.
2. Loosen the spark plug 1 or 2 turns.
3. Brush or using compressed air, blow away any dirt from around the spark plug.
4. Remove the spark plug.

If removing more than one plug, place each plug in a tray marked with the corresponding cylinder number.

1. Correctly position the spark plug washer.
2. Inspect the spark plug gap. Adjust the gap as needed.

Specification
Spark plug gap: 1.016 mm (0.040 in).

3. Hand start the spark plug in the corresponding cylinder.

Caution: Refer to Fastener Caution in the Preface section.

4. Tighten the spark plug.

Tighten
Tighten the plug to 15 N·m (11 lb ft).

5. Install the spark plug wire. Refer to Spark Plug Wire Replacement.